Answer:
To find the number of antinodes in the standing wave pattern, we need to find the wavelength of the fifth harmonic. The fifth harmonic has a frequency of 5 times the fundamental frequency, and the fundamental frequency is equal to the speed of sound divided by the length of the pipe. Thus, the wavelength of the fifth harmonic is the speed of sound divided by 5 times the fundamental frequency, which is equal to 340 m/s / (5 * (340 m/s / 1.5 m)) = 0.3 m.
Since the length of the pipe is 1.5 m, and the wavelength is 0.3 m, there will be 1.5 m / 0.3 m = 5 full wavelengths in the pipe. Since there is an antinode at both ends of the pipe, there will be a total of 5 + 2 = 7 antinodes in the standing wave pattern. Therefore, the correct answer is (C) 7.
a basketball player jumps straight up for a ball. to do this, he lowers his body 0.300 m and then accelerates through this distance by forcefully straightening his legs. this player leaves the floor with a vertical velocity sufficient to carry him 0.900 m above the floor. (a) calculate his velocity when he leaves the floor.
The velocity of the basketball player when he leaves the floor is 3.33 m/s.
How does the player's vertical velocity relate to the height he reaches while jumping?The player's vertical velocity is directly related to the height he reaches while jumping. The greater the player's vertical velocity, the higher he will be able to jump. In this case, the player's vertical velocity is sufficient to carry him 0.900 m above the floor. Without this velocity, he would not be able to reach this height. Additionally, the initial velocity is dependent on the potential energy converted to kinetic energy and the distance to cover during the movement.
How do you calculate his velocity when he leaves the floor?The following kinematic equation can be used to determine the basketball player's velocity:
v^2 = u^2 + 2as
v = √(2as) (2as)
The force and mass of the player can be used to compute the acceleration.
Assuming that the player advances vertically 0.300 m, the force is the force the player applies to the ground.
F=m x a and a=F/m
Task, W = F x d
The change in kinetic energy is equivalent to the work completed.
W = Fd = ma x d = 1/2 x m x v2 W = 1/2 x m x v2 W = a = 2 x W / m x d = 2 x v2 / d
Changing the value of an in the previous equation:
v = √(2 x 0.900 m x v^2 / 0.300 m)
v = √(6 x v^2)
v = √(6) (6) x v
v = 3.33 m/s
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bonus: an airplane traveling northeast at a speed of 25 m/s increases its speed to 30 m/s in 10 seconds. what is the airplane's acceleration?
An aeroplane travelling northeast at 25 m/s increases its speed to 30 m/s in 10 seconds. The aeroplane accelerates at 0.5 m/s².
a=v-u/t
a= 30-25/10
a= 5/10
a= 0.5 m/s²
Speed is defined as the ratio of distance travelled to time spent travelling. Because it has only one direction and no magnitude, speed is a scalar quantity.
The most important concept in science is measurement. Many measurable quantities are expressed in base or physical fundamental units. One such measurable quantity is speed, which is defined as the ratio of the distance travelled by an object to the time required to travel that distance. Let us learn about speed in depth in this session.
When an object travels the same distance in equal time intervals, it is said to be moving at a uniform speed. When an object travels a different distance at equal intervals, it is said to be moving at a variable speed.
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A 57g tennis ball is served at 45m/s .
If the ball started from rest, what impulse was applied to the ball by the racket?
Express your answer using two significant figures.
The impulse is 2565 gm/s or Ns ( Newton seconds) rounded to two significant figures.
What do you mean by impulse?
Impulse is a measure of the change in momentum of an object, and it is given by the product of force and time for which the force is applied. Mathematically, impulse is represented as the integral of force with respect to time. The impulse-momentum theorem states that the impulse applied to an object is equal to the change in momentum of the object.
The impulse applied to the ball by the racket can be calculated using the impulse-momentum theorem, which states that the impulse applied to an object is equal to the change in momentum of the object. The impulse is equal to the force multiplied by the time for which the force is applied.
Impulse = change in momentum = final momentum - initial momentum
The final momentum of the ball is 57g * 45m/s (mass * velocity)
The initial momentum is 0 (since the ball starts from rest)
Therefore,
Impulse = 57g * 45m/s - 0
The impulse is 2565 gm/s or Ns ( Newton seconds) rounded to two significant figures.
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what did newton discover about gravity? group of answer choices the law of universal gravitation the newtonian synthesis the equation for the force of gravity all of these.
Newton discovered the law of gravitation, the Newtonian synthesis and the equation for the force of gravity (All of the above)
What is law of universal gravitation, Newtonian synthesis and the equation for the force of gravity?Isaac Newton discovered the law of universal gravitation, which states that every object in the universe attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
This is often represented by the equation F = G(m1m2)/r^2, where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them.
Newton's discovery of the law of universal gravitation marked a major breakthrough in our understanding of the motions of celestial bodies and laid the foundation for modern physics and astronomy.
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The law of universal gravitation, the newtonian synthesis and the equation for the force of gravity according to the given choices.
What was discovered regarding gravity by Sir Isaac Newton?According to Newton, the same force that causes an apple to fall from a tree also maintains the moon's position. The law of universal gravitation was the result of years of labour by Newton.
What is the formula for the gravitational force?Gravitational force is equal to (gravitational constant times the masses of the first and second objects) / 2 multiply by (Distance between the centre of two bodies)2. Through an invisible force of attraction, the Earth draws everything toward it. The term gravitation, gravitational pull, or force of gravity is used to describe this force of attraction.
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mercury has a specific gravity of 13.6. how many milliliters of mercury have a mass of 0.35 kg? a. 0.0257 ml b. 0.026 ml c. 25.7 ml d. 26 ml e. 4760 ml
26 ml. of mercury have a mass of 0.35 kg. So option d is correct.
To find the volume of the mercury, we can use the relationship between mass, density, and volume, which is:
mass = density x volume
The density of mercury is 13.6g/cm^3 and its mass is 0.35 kg
so, we can rearrange the formula to:
volume = mass/density
To convert the volume to milliliters we can use the conversion factor 1cm^3 = 1 ml
So,
volume = (0.35 kg) / (13.6 g/cm^3) = (350000 g) / (13.6 g/cm^3) = 25714.28 cm^3 and since 1 cm^3 = 1ml
volume = 25714.28 ml
Thus, 26 ml. of mercury have a mass of 0.35 kg. So option d is correct.
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) if the nearest object is 10 cm from the observer, approximately how far away is the farthest object in cm?
This same statement expresses the fact that to the furthest item is 80 cm distant.
An object declaration class is what?The combination of objects known as an object class may be characterised in by the traits that all of its members share. So all e-mail systems get some characteristics, generic e-mail, for instance, may be an object class.
The left item has travelled about 1/4 of the distance contrasted to the centre object, which means that if the centre object were to be pushed half as far as the right object, it would be pretty far away (20 cm). Consequently, add 4 to the centre object's distance.
It is 80 cm distant from the furthest item.
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The complete question is-
If the nearest object is 10 cm from the observer, approximately how far away is the farthest object?
________cm
a soft tennis ball is dropped onto a hard floor from a height of 1.50 m and rebounds to a height of 1.00 m. (assume that the positive direction is upward.) (a) calculate its velocity (in m/s) just before it strikes the floor.
Its velocity (in m/s) just before it strikes the floor is - 5.42 m/s.
The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The meter per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Alternately, the magnitude of velocity can be expressed in centimeters per second (cm/s).
Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.
Given,
height = 1.50m
rebound height = 1.00m
Using the equation of motion,
v² = u² - 2as
⇒ v = - √(u² + 2(-9.81 m/s² × - 1.50m))
⇒v = - 5.42 m/s
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what is quietest? ball bearing roller is smoother and quieter quiests silent frictionless pockect door rollers top hung
Ball bearing roller is considered a better option for the pocket doors as compared to the top hung rollers due to reason of friction.
What is friction?Friction is the force defying the relative side(tangential) motion of solid surfaces, fluid layers, or material elements in contact. It's generally subdivided into several kinds. Friction isn't a fundamental force, as it's deduced from electromagnetic force between charged particles, including electrons, protons, atoms, and molecules.
A ball bearing roller is generally considered to be the quietest type of roller for pocket doors. This is because the ball bearings in the roller allow for smooth, low-friction movement, which reduces noise and wear on the door and track. Frictionless or silent pocket door rollers, such as those using a track with a recirculating ball bearing, would also be very quiet. Top hung rollers also have the advantage of not having any contact with the floor and less noise.
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when helping a friend move into a new home, you push a chair across the room. what do you know about the force of friction applied to the chair by the floor?
If the velocity of the chair is constant, then the net force reserve on it is zero. The force you apply to keep it going is equal and opposite to the force of friction.
friction, force that oppose the sliding or rolling of one solid object over another. Frictional forces, such as the grip needed to walk without slipping, may be favorable, but they also present a great compute of opposition to motion.
About 20 percent of the engine power of automobiles is inject in overcoming frictional forces in the moving parts.
The major cause of friction between metals emerges to be the forces of attraction, known as adhesion, between the contact section of the surfaces, which are always microscopically uneven.
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Echolocation is a form of sensory perception used by
most bats, toothed whales and porpoises, as well as a
few birds. The animal emits a pulse of sound which
is reflected from objects; the reflected pulse is then
detected by the animal to learn about its environ-
ment or interact with other animals. Echolocation • waves emitted by whales have frequencies of about 200,000Hz. (a) What is the wavelength of the whale's echolocation wave? (b) If an obstacle is 100m from the whale, how long after the whale emits a wave will the reflected wave return to him?
Answer:
(a) What is the wavelength of the whale's echolocation wave?
When you make several trips to unload a few heavy items from a car instead of moving them all at once, the total distance over which you exert yourself________________.
When you make several trips to unload a few heavy items from a car instead of moving them all at once, the total distance over which you exert yourself increases.
When you make multiple trips to unload heavy items from a car, you are covering the same distance multiple times, which increases the total distance over which you exert yourself.
Carrying heavy items repeatedly can cause strain on the muscles, joints, and bones, especially if not done properly, which can lead to injuries over time. It would be more efficient to move all of the items at once, as this would reduce the total distance covered and the overall amount of effort required.
This is a simple example of the principle of "work smart, not hard".
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what type of acceleration is used to maintain slow forward motion or allow speed to increase gradually
The type of acceleration used to maintain slow forward motion or allow speed to increase gradually is called constant acceleration.
What is constant acceleration?This type of acceleration refers to a change in velocity that occurs at a constant rate over a period of time, in other words the acceleration is uniform.
For example, a car that is accelerating from a stop to a slow, steady speed would be experiencing constant acceleration. The speedometer in the car would show a gradual increase in speed, rather than a sudden jump.
This is different from non-uniform acceleration, where the rate of change in velocity is not constant. For example, a car accelerating rapidly from a stop to a high speed would be experiencing non-uniform acceleration, as the speedometer would show a rapid increase in speed.
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If the solar system were the size of your campus, how far away would the nearest star be?.
The nearest star, Proxima Centauri, would be about 4.22 light-years away if the solar system were the size of a campus.
The scale of the solar system is vast and difficult to imagine. To give a sense of perspective, if the solar system were scaled down to the size of a campus, with the sun at the center of the campus, the nearest star, Proxima Centauri, would be located about 4.22 light-years away or 24.9 trillion miles. That would be equivalent to traveling around the world over 1,174,000 times. This distance is extremely large and it is hard to comprehend but this gives us an idea of how vast and empty space is. Even the closest stars to our solar system are incredibly distant, and it's hard to imagine just how far away the more distant stars and galaxies are.
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ike pages from a book, this sample pulls apart in thin sheets of a dark see through black layers. Due to its nature of see through dark sheets the geologist has determine this to not be a metallic material opting more for virtuous appearance.
According to the field geologist's information, the mineral is biotite. Biotite can be separated into sheets and has vitreous sheen in hand specimens. Its color ranges from dark black to brown.
What is the purpose of biotite?Uses. The age of rocks is frequently constrained using biotite using potassium-argon dating or argon-argon dating. These techniques might only be able to determine the minimum ages of many rocks due to the ease with which argon escapes from the biotite crystal structure at high temperatures.
Where can you most often find biotite?Numerous places in Europe, like Monzoni and Mount Vesuvius, have biotite in their lavas. It can be found in the granite of Pikes Peak, Colorado, as well as in the pegmatites of New England, Virginia, and North Carolina in the United States. Biotite is a
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How many electrons have been removed from a positively charged cube if it has a net charge of 7.5 x 10^-11 C
Answer:
Explanation:
The net charge of an object is equal to the number of electrons removed or added multiplied by the charge of an electron (1.6 x 10^-19 C).
Given: Q = 7.5 x 10^-11 C
To find the number of electrons removed we can use the formula :
Q = n * e
where Q is the charge, n is the number of electrons, and e is the charge of an electron
n = Q/e
Therefore, n = 7.5 x 10^-11 C / 1.6 x 10^-19 C = 4.6875 x 10^8 electrons
So, 4.6875 x 10^8 electrons have been removed from a positively charged cube with a net charge of 7.5 x 10^-11 C
consider a system consisting of two objects initially moving separately. the two objects collide and stick together. if the objects continue moving after crashing, what can we state about the kinetic energy and momentum of the system before and after the crash?
After staying together, the two objects come to rest while retaining motion but losing kinetic energy. Heat is created when some of the motion's energy momentum is transformed to thermal energy.
What happens when two things clash with one another?
Each thing pushes the other when two objects come into contact. Imagine using a bat to strike a softball. The ball is pushed away by the bat when it collides with it. The bat experiences force from the ball as well.
Which two sorts of collisions are there?
Collisions might be of two different types: collisions that are inelastic: momentum is preserved, Momentum and kinetic energy are both preserved in elastic collisions.
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What are three experimental factors that might have contributed to the percent difference between fg and fc?
a. the radius
b. the speed
c. the weight
The three experimental factors that might have contributed to the percent difference between fg and fc are radius, speed and weight.
What connection exists between hanging weight and centripetal force?The centripetal force holding mass m1 in a horizontal circular orbit is equal to the weight of the hanging mass. When an object is moving at a certain speed, its weight exerts a force on it that causes the required centripetal acceleration; the track exerts no force on the object at all.
What forces are operating on a hanging object?The downward pull of gravity and the upward tension force are the only two forces that the hanging mass (m2) is subject to. The centripetal acceleration of an item is independent of mass; as a result, the centripetal acceleration is unaffected by changes in mass.
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a toy cannon uses a spring to project a 5.20-g soft rubber ball. the spring is originally compressed by 4.90 cm and has a force constant of 7.97 n/m. when the cannon is fired, the ball moves 14.7 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.031 5 n on the ball. (a) with what speed does the projectile leave the barrel of the cannon?
The speed of the projectile leaving the barrel of the cannon can be calculated using the equation:v = √(2Fx/m),where F is the force applied to the projectile, x is the distance the projectile travels, and m is the mass of the projectile.Plugging in the given values we get:v = √(2*(7.97N/m)*(4.9cm) / (5.20g)),v = 15.5 m/s
What is the force ?Force is an influence that causes an object to change its momentum, either by changing its speed, direction, or both. It is one of the fundamental concepts in physics and is usually described as a push or pull. It can be described mathematically as a vector, and it can be measured in newtons (N). Forces are a result of interactions between two objects, and they can be contact forces, such as friction, or non-contact forces, like gravity. Forces can also be generated internally, such as when a muscle contracts. Forces can cause objects to accelerate, decelerate, bend, or change shape.
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a bucket filled with water has a mass of 23 kg and is attached to a rope, which in turn is wound around a 0.05 m radius cylinder at the top of a well. what torque does the weight of the water and bucket produce on the cylinder? (g
Torque the weight of the water and bucket produce on the cylinder is 11.4NM
What is torque?
Torque is a measure of how much a force causes an object to rotate around an axis. It is the rotational equivalent of force. It is measured in Newton-meters (Nm).
Torque = Force x Radius
Force = Mass x Acceleration due to gravity
Torque = (23 kg x 9.81 m/s2) x 0.05 m
Torque = 11.4 Nm
Hence, Torque the weight of the water and bucket produce on the cylinder is 11.4NM
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there is a cerain grsavitatiounal orce between a pplanet and its moon. by doubling the mass and radious what happens to its force
By doubling the mass and the radius, the force of gravitation would also be doubled as it is directly proportional to the mass of the interacting objects.
The more massive object will pull the other body with a stronger gravitational pull since the force of gravity is exactly proportional to the masses of the two interacting bodies. Therefore, when two things' respective masses increase, so does their gravitational pull to one another. The gravitational pull between any two objects is equal to the product of their individual masses. Hence, if the mass is doubled, the gravitational force will also get doubled.
According to the Newton's law of universal gravitation, force of gravitation is directly proportional to the masses of the two interacting bodies while it is inversely proportional the the square of the distance between them. Putting 'G' as the proportionality constant, we get that
F = Gm1m2 / r²
where, m1 and m2 are the masses of the two bodies, and r is the distance between them.
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T/F since v = λ f, the speed v of a wave depends on its frequency f.
The statement that "the speed v of a wave depends on its frequency (f)" is true.
Speed(v) is the distance travelled by an object or wave in unit time. Whereas frequency(f) of a wave is the number of oscillations or number of complete cycles in one second is called frequency(f). On the other hand the distance between two consecutive trough or crest is called the wavelength(λ), in which a wave completes a cycle. The relation between the speed(v), wavelength(λ), and frequency is as follows:
v = λf
Hence we can say that velocity of a wave depends on its frequency.
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Find the mesh currents i, i2, and i3. Find the mesh currents i1, 2, and i3. 31 3 R2 ib 3 10 V(+ 4 Given Variables: R1:8 ohm R2: 2 ohm R3: 2 ohm Given Variables R1:2 ohm R2 1 ohm R3: 1 ohnm R4: 2 ohnm V1:2V V2:1 V
The mesh current have the values i1=1, i3=2, for the given variables: R1:8 ohm R2: 2 ohm R3: 2 ohm Provided Variables R1:2 ohm R2 1 ohm R3: 1 ohnm R4: 2 ohm V1:2V V2:1 V
The circuit
i₂ = -3A
KCL should be applied at node X id = 3+i3 from ckt Va = (i1-i2).
²\sVa = (i₁+3)
Since this is a super mesh analysis, apply EVL to loop i1, i3.
i₁ = 3ib +i₃\s=3(3+i₃) +i₃\si₁-4i₃=9
the loops 1, 3, and EVL
2(i₁-i₂)
-10+8i₃+2Va+2(i₃-i₂)=0
2i₁-2(-3)
-10+8i₃+2(i₁+3)
2+2i₃-2(-3)=0
i₁(2+4)+i₃(8+2)
-10+2+6+6=0
6i₁+10i₃+14=0
3i1+5i3=7 based on this
i₁=1\si₃= 2
Mesh Current Analysis is a method for locating the currents flowing through any closed channel in a circuit, including a loop or mesh.
Kirchhoff's Laws provide the fundamental framework for analysing any complicated electrical circuit, but there are a number of techniques to enhance this framework by employing Mesh Current Analysis or Nodal Voltage Analysis, which reduces the amount of arithmetic required.
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A 4. 88-kg bowling ball moving east at 2. 41 m/s strikes a stationary 0. 95-kg bowling pin. Immediately after the head-on collision, the pin is moving east at 5. 19 m/s. Determine the post collision velocity of the bowling ball.
The post collision velocity of the bawling ball is 2.35 m/sec, if the mass of the bowling ball is 88 kg and the mass of the pin is 0.95 kg.
The law of conservation of momentum will be used here to determine the post collision velocity of the ball.
Mass of the bowling ball, M₁ = 88 kg
Mass of the pin, M₂ = 0.95 kg
Before collision velocity of the ball, v₁ = 2.41 m/s
Let the post collision velocity of the ball = v₃
Pre-collision velocity of the pin, v₂ = 0
Post collision velocity of the pin, v₄ = 5.19 m/sec
By the law of conservation of momentum,
M₁v₁ + M₂v₂ = M₁v₃ + M₂v₄
88 × 2.41 + 0.95 × 0 = 88 × v₃ + 0.95 × 5.19
v₃ = 2.35 m/sec
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particle a has less mass than particle b. both are pushed for ward across a frictionless surface by equal forces for 1 s. both start from rest. a. compare the amount of work done on each particle. that is, is the work done on a greater than, less than, or equal to the work done on b? explain. b. compare the impulses delivered to particles a and b. explain.
Weston is practical in a particle, because particle A has less mass than particle B, particle A will accelerate more rapidly.
Friction is the barrier to motion of one thing moving relative to another. According to the International Journal of Parallel, Emergent and Distributed Systems, it is not regarded as a basic force like electromagnetic or gravity (opens in new tab). The laws governing friction were first put together by scientists in the 1400s, according to the book Soil Mechanics(opens in new tab).
However, because the interactions are so intricate, it usually takes tests to characterize the force of friction under various conditions and cannot be determined only from equations or laws. Every general frictional rule has a number of exceptions.
Weston is therefore applicable to An Particle A.
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A proton with an initial speed of 900,000 m/s is brought to rest by an electric field.
What was the potential difference that stopped the proton?
Express your answer to two significant figures and include the appropriate units.
What was the initial kinetic energy of the proton, in electron volts?
Express your answer using two significant figures.
The potential difference that stopped the proton is 8.75 × 10²⁴ V.
The kinetic energy of the proton is 2.25 × 10⁻¹³ J or 1.4 × 10⁶ eV.
What is potential difference?The potential difference that stopped the proton can be found using the equation: work done = qV = kinetic energy lost, where q is the charge of the proton (1.6 x 10⁻¹⁹ C), V is the potential difference, and kinetic energy lost is the initial kinetic energy of the proton.
Since the proton is brought to rest, the final kinetic energy is 0, so the initial kinetic energy can be found by:
kinetic energy = 1/2 × m × v²
where m is the mass of the proton (1.67 x 10⁻²⁷ kg) and v is the initial speed of the proton (900,000 m/s), the kinetic energy of the proton is 2.25 × 10⁻¹³ J or 1.4 × 10⁶ eV.
The potential difference can be found by:
V = kinetic energy lost / qV = 1.4 × 10⁶ eV / 1.6 × 10⁻¹⁹ C V = 8.75×10²⁴ V.
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Which of the following quantities does the moment of inertia depend on (select all that apply)? The amount of mass M the object has The torque applied to the object The distribution of the object's mass relative the rotational axis The object and angular velocity L The object s angular acceleration
Moment of inertia is affected by a body's mass, how that mass is distributed within it, where its axis of rotation is located, and how far it is from that axis. Thus, all options are valid.
Moment of inertia: What is it?Moment of inertia gauges an object's resistance to variations in rotational motion. A body's resist to changes in rotation is determined by a moment of inertia from its cross-section. It depend on how far away from the center of the body each portion of the mass is.
What is the purpose of moment of inertia?One of the numerous mass qualities that describes an item's stability as well as the forces required to change its motion is said to be the moment of inertia. Stability is a key component in the design and manufacture of air and spacecraft in aeronautical engineering.
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which property is unique to electromagnetic waves?(1 point) responses they can shake structures on earth. they can shake structures on earth. they can travel in a vacuum. they can travel in a vacuum. they can travel on the surface of water. they can travel on the surface of water. they can be controlled by the pull of gravity. they can be controlled by the pull of gravity.
The property is unique to electromagnetic waves are that they can travel in a vacuum and they can travel on the surface of water.
In a vacuum, can electromagnetic waves travel?Unlike mechanical waves, which need a medium to travel, electromagnetic waves can move through air or space. This indicates that electromagnetic waves are capable of passing not only through solid objects like air and rock but also through a vacuum like space.
What kinds of electromagnetic waves are there?Electromagnetic waves include those produced by radio and television signals as well as microwaves. The only thing separating them is wavelength. The distance between one wave crest and the next is known as the wavelength.
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A police officer recorded the speeds of 100 cars in a 50-mile-per-hour zone. The results are in the box plot shown. How many cars were going between 40 and 48 miles per hour?32 20 2516
The 25 cars (C) represent those traveling between 40 and 48 miles per hour.
A box plot or boxplot is a visual representation of the location, dispersion, and skewness groups of quartiles of numerical data. These are employed when displaying the distribution of data points across a chosen metric. These graphs show the ranges of the measured variables.
A box plot displays 25% of the data in each section. In this range, 25% of the data is displayed. Therefore, 100 individuals are included for each component. In order to determine the number of cars present between the 40 and 48 box plot, we will multiply 100 by 25%, which is 25 cars.
Thus Option C is the right choice.
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a boy is using a rope to pull a sled to the right. what are the directions of the tension force and the friction force on the sled respectively?
Answer:
Tension force: towards boy
Friction: away from boy
Explanation:
For this problem, assume that the boy is pulling the sled from left to right
Tension force:
The tension force is going to the right (towards the boy) because the boy is the one who is applying the tension force onto the sled for it to follow him.
Friction force:
In this case, there is kinetic friction between the ground and the sled. The kinetic friction is slowing down the sled, which is going to the right, therefore the direction of the friction force is pointing to the left (away from the boy)
A man pushed with 3.5 N on a crate of oranges for 3 seconds. If the crate moved 2 meters, what was the power delivered? Round to one decimal.
Answer:
P = 2.3 W
Explanation:
power = work done/time
∴ work done = force x distance
P = (F x d)/t
F = 3.5 N
t = 3 s
d = 2 m
P = ?
P = (3.5 x 2)/3
P = 2.3 W
