Complete Question:
A force of 5.0 N moves a 6.0 kg object along a rough floor at a constant speed of 2.5 m/s.
(a) How much work is done in 25 s?
(b) What power is being used?
(c) What force of friction is acting on the object?
Answer:
a. Workdone = 312.5 Joules.
b. Power = 12.5 Watts.
c. Force of friction = 5 Newton.
Explanation:
Given the following data;
Force = 5N
Speed = 2.5m/s
Mass = 6kg
Time = 25 secs
a. To find the work done.
We would first solve for the distance covered by the object.
Distance = speed * time
Distance = 2.5 * 25
Distance = 62.5 meters.
Workdone = force * distance
Workdone = 5 * 62.5
Workdone = 312.5 Joules.
b. To find the amount of power being used.
Power = workdone/time
Power = 312.5/25
Power = 12.5 Watts.
c. To find the force of friction is acting on the object.
Since we know that there is no net force acting on the body. Therefore, the force of friction is equal to 5 Newton.
a) Power is being used will be 12.5 Watts.
b) Force of friction is acting on the object will be 5 Newton.
What is the friction force?It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N).
Mathematically it is defined as the product of the coefficient of friction and normal reaction.
The given data in the problem is;
m is the mass of object =6.0 kg
u is the speed =2.5 m/s
a) Power is being used will be 12.5 Watts.
The distance traveled by the object is;
[tex]\rm d = v \times t \\\\ \rm d = 2.5 \times 25 \\\\ \rm d = 62.5 m[/tex]
The work done is the product of force and displacement;
[tex]\rm W = F \times d \\\\ \rm W = 5 \times 62.5 \\\\ \rm W = 312.5 \ J[/tex]
The power is the ratio of work done to the time;
[tex]\rm P= \frac{W}{t} \\\\ \rm P= \frac{312.5 }{25 } \\\\\ \rm P=12.5 \ Watt[/tex]
Hence Power is being used will be 12.5 Watts.
b) Force of friction is acting on the object will be 5 Newton.
If the all unbalanced force is zero the net force is equal to the force of friction;
The force of friction= Net force
Force of friction= 5 Newton.
Hence the force of friction is acting on the object will be 5 Newton.
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Which of the following is an example of acceleration?
A) Standing in position while waiting to begin jumping jacks.
B) A leaf blown from a tree by the wind.
C) Gravity holding a rock still on the ground.
D) Slowing a bike by applying the brakes.
Answer:
B) a leaf blown from a tree by the wind
Answer:
the answer is B A leaf being blown from a tree by the ground
Isabella has lived in Miami, Florida, all her life, and she knows the weather is warm and humid much of the time. What factors play a part in determining the climate found in Florida? Choose the three that apply
A-Ocean currents
B-Latitude
C-High altitude
D-Prevailing winds
E-Long distance from water
Answer:
B,A, and D
Explanation:
A baby carriage is rolling down a hill. Take into consideration, the carriage has 90J of kinetic energy and the mass of the carriage is 0.5m. If you can only run at a speed of 10m/s, will you catch the baby carriage? What is the velocity of the carriage?
Answer:
YES. 6√10
Explanation:
apply E=1/2mv^2 and find the velocity of carriage which is 6√10 ms-1
as our velocity is higher than that of cart. we can catch the carriage
Can you please tell me the answer
Answer:
Explanation:
s=d/t
7.5 times 10^10/8.0 times 10^6=9.375 times 10^15
Hope this helps
Which of the following statements about gravity is FALSE?
B
A Gravity plays an important role in the formation of solar systems.
Gravity keeps the planets in their proper orbits around the Sun.
Stars are made of clouds of dust and gas that come together as a result
of gravity.
The Law of Universal Gravitation states that the gravitational force is
stronger as objects get farther apart.
с
D
Answer:
the last one. gravitational force is stronger as objects get further apart
The false statement about gravity among the given choices is - D. The Law of Universal Gravitation states that the gravitational force is stronger as objects get farther apart.
Gravity or the universal gravitational force is the force of attraction exerts between any two objects with mass in the universe. It is also exerted between the attraction of the earth's mass and bodies with mass near its surface.
The universal gravitational force is inversely proportional to the square of the distance between any two objects,[tex]F = \frac{1}{r^2}[/tex]So, an increase in the distance will result in the force of gravitational attraction between them also decreases make it weaker.The universal gravitational force plays an important role in making the solar system by keeping the different planets in their proper orbits around the Sun.Thus, The false statement about gravity among the given choices is - option D.
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A 2kg baseball has a momentum of 75 kg m/s. Find it’s speed
Answer:
37.5m/s
Explanation:
momentum = mass x velocity
momentum / mass = velocity = speed
75kg*m/s / 2kg = 37.5m/s
Convert 50,000 ML to mL
1. 5 x 10^5 mL
2. 5 x 10^-5 mL
3. 5 x 10^13 mL
4. 5 x 10^-13 mL
An outfielder with a mass of 86 Kilograms catches a baseball with a mass of 0.15 kilograms.The velocity of the ball just before being caught is 40 meters per second.What is the impulse imparted by the ball onto the outfielder?
A. 6.00 Ns
B. 3,440 Ns
C. 2.00 Ns
D. 3,434 Ns
Answer:
C
Explanation:
According to Coulomb's law, the force of attraction or repulsion between two charges is
A.
directly related to the magnitudes of the charges and the square of the distance between them.
B.
inversely related to the magnitudes of the charges and the square of the distance between them.
C.
directly related to the magnitudes of the charges and inversely related to the square of the distance between them.
D.
inversely related to the magnitudes of the charges and directly related to the square of the distance between them
Answer:
B is the answer
Explanation:
thank you I hope it helps you
The force is directly related to the magnitudes of the charges and inversely related to the square of the distance between them. Then the correct opption is C.
What is the Coulomb's law?The Coulomb's law states that the electrostatic force is the ratio of the product of the charges and square of the distance between them.
Let the cherges be q and Q and the distance between them is r. Then the force is given as,
F = kqQ / r²
The power is straightforwardly connected with the extents of the charges and contrarily connected with the square of the distance between them. In this way, the right choice is C.
Thus, the correct option is C.
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PLEASE HURRY!!!!!!!!
Your brother pulls up to a corvette at a stop light and revs his engine. When the light turns green he slams the gas pedal to the floor. He begins at 9km/hr and after 6 seconds is going 82Km/hr. What was his acceleration rate? (Hint: your label with be Km/hr/s)
Answer:
9.1km/hr...................I think I'm not %100
Two conducting spheres rest on insulating stands. Sphere B is smaller than Sphere A. Both spheres are initially uncharged and they are touching. A third conducting sphere, C, has a positive charge. It is brought close to (but not touching) Sphere B as shown. What is the net charge (positive, negative, or zero) on Sphere A?
Answer:
Explanation:
Sphere B and sphere A are touching so they will act as a single body . A positively charged sphere C is brought near sphere B . So there will be induction of charge on sphere B and sphere A . Opposite charge will be induced on nearer sphere and same charge will be induced on distant sphere . Hence sphere B will be negatively charged and sphere A will be positively charged. The amount of charge induced on sphere B and A will be same and it will remain as long as sphere C is kept near sphere B . As soon as sphere C is removed , induced charges will also neutralize each other .
What is the average velocity of someone who walks 3 km in a half hour, then 3 km in an hour, then 6 km in an hour and a half?
Answer:
The average velocity is 4 [tex]\frac{km}{hour}[/tex]
Explanation:
Velocity is the magnitude that relates the change in position with time. That is, the speed expresses the relationship between the space traveled by an object and the time used for it.
The average velocity relates the change in position with the time taken to effect said change through the expression:
[tex]velocity=\frac{distance}{time}[/tex]
In this case:
distance= 3 km + 3 km + 6 km= 12 kmtime= half hour + an hour + an hour and a half= 30 minutes + 1 hour + 1 hour 30 minutes= 0.5 hour + 1 hour + 1.5 hour= 3 hoursReplacing:
[tex]velocity=\frac{12 km}{3 hours}[/tex]
Solving:
velocity= 4 [tex]\frac{km}{hour}[/tex]
The average velocity is 4 [tex]\frac{km}{hour}[/tex]
All celestial objects we tracted to each other by gravity.Asteroids A and B are 5 meters (m) part. Asteroids C and D are also 5 m apart. Asteroids A and B both have a mass of 5 kilograms(kg) and asteroids C and D both have a mass of 7 kg.Between which set of asteroids is the gravitational attraction?
A between asteroids c and d because gravitational attraction is greatest with increased mass
B between asteroids a and b because gravitational attraction is greatest with decreased mass
C between asteroids a and b because gravitational attraction is greatest with increased distance
D between asteroids c and d because gravitational attraction is greatest with increased distance
A boy is holding a ball 1 m from the ground with a force of 20 N. He holds it still for 60seconds. How much power in watts is being used in this situation?
Answer:
Power = 0.33 Watts
Explanation:
Given the following data;
Distance = 1m
Force = 20N
First of all, we would solve for the work done by the boy.
Workdone = force * distance
Substituting into the equation, we have;
Workdone = 20*1 = 20J
Now to find power;
Power = workdone/time
Power = 20/60
Power = 0.33 Watts.
When synthetic materials are made from natural materials, the atoms that make
up the original substances are regrouped into new molecules. *
True
False
The net electric flux through a cubic box with sides that are 22.0 cm long is 4950 N⋅m2/C . What charge is enclosed by the box?
Answer:
43.83 nC
Explanation:
We know Q = ε₀Ψ where Q = charge enclosed by the cubic box, ε₀ = permittivity of free space = 8.854 × 10⁻¹² F/m and Ψ = net electric flux through cubic box = 4950 Nm²/C
So, substituting the values of the variables into the equation, we have
Q = ε₀Ψ
= 8.854 × 10⁻¹² F/m × 4950 Nm²/C
= 43827.3 × 10⁻¹² C = 4.38273 × 10⁻⁸ C
= 43.8273 × 10⁻⁹ C
= 43.8273 nC
≅ 43.83 nC
1. Which energy source has no greenhouse gas emissions or health impacts on humans, but is only available in certain geographic locations?
Geothermal power
Nuclear power
Hydrogen fuel
Methane gas
Answer:Nuclear power
Answer: geothermal
Explanation: I just took this test.
2. List a similarity between magnetic force and gravitational force,
Answer:
Both Electrical and Magnetic Forces take place between two charged objects
Explanation:
a car starts at a speed of 3.5m/s and picks up speed for 2.8 seconds until it is traveling 7.2 m/s; the car traveled 15.0 meters. What is the car's acceleration
Answer:
a = 1.32 [m/s²]
Explanation:
To calculate this problem we can use the following equation of kinematics.
[tex]v_{f}=v_{o}+a*t[/tex]
where:
Vf = final velocity = 7.2 [m/s]
Vo = initial velocity = 3.5 [m/s]
t = time = 2.8 [s]
a = acceleration [m/s²]
[tex]7.2=3.5+a*2.8\\2.8*a=3.7\\a=1.32[m/s^{2} ][/tex]
Please Help Me!!!........
Answer:
1.Siddartha Gautama
2.no single founder
3jesus christ
4.muhammad
5.abraham
5 A truck travelling at 25 m/s puts on its brakes for 4 s. This produces an acceleration of –2 m/s. What is the truck's
velocity after braking?
Answer: The truck's velocity after braking = 17m/s.
Explanation:
Given: Initial velocity(i) = 25 m/s
Time(t) = 4s
Acceleration(a) = -2 m/s ²
We use the following formula to compute final velocity (v):
[tex]v= i+at\\\\\Rightarrow\ v=25+(-2)(4\ \ \ [\text{Substitute all values}]\\\\\Rightarrow\ v=25-8\\\\\Rightarrow\ v=17\ m/s[/tex]
Hence, the truck's velocity after braking = 17m/s.
a steel sphere and brass ring have diameter 25cm and 24.9cm at 15°C.If the sphere and the ring are heated together.what is the temperature at which the sphere could pass through the ring? alpha steel= 12×10^-6 and alpha brass= 20×10^-6
Answer:
Explanation:
Due to heat energy , metal expands . Formula for linear expansion is as follows .
L = l ( 1 + α Δt )
where L is expanded length , l is original length , α is coefficient of linear expansion and Δt is increase in temperature .
To pass the sphere through the ring , the diameter of both ring and sphere should be same after heating . Let after increase of temperature Δt , their diameter becomes same as L . The linear coefficient of brass and steel are
20 x 10⁻⁶ and 12 x 10⁻⁶ respectively .
For steel sphere ,
L = 25 ( 1 + 12 x 10⁻⁶ Δt )
For brass ring
L = 24.9 ( 1 + 20 x 10⁻⁶ Δt )
25 ( 1 + 12 x 10⁻⁶ Δt ) = 24.9 ( 1 + 20 x 10⁻⁶ Δt )
1.004( 1 + 12 x 10⁻⁶ Δt ) = ( 1 + 20 x 10⁻⁶ Δt )
1.004 + 12.0482 x 10⁻⁶ Δt = 1 + 20 x 10⁻⁶ Δt
.004 = 7.9518 x 10⁻⁶ Δt
Δt = 4000 / 7.9518
= 503⁰C.
final temp = 503 + 15 = 518⁰C .
One star has a magnitude of -1.5 and another star has a magnitude of +0.6. What is the ratio of brightness of these two stars?
Answer:
7
Explanation:
[tex]The \ ratio \ of \ brightness \ of \ these \ two \ stars \ is:[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(m_{(second \ star )} - (m_{first \ star } ))}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(0.6 - (-1.5 ))}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(2.1)}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 6.9[/tex]
[tex]\mathbf{\dfrac{b_{first \ star }}{b _{second \ star }} \simeq 7}[/tex]
b) We find
all matter.
Lesson exercise
1. A stone has a mass of 200 grams. When it is immersed in a measuring cylinde
of water, the water rises 100 ml. What is the density of the stone?
2. A 48 g metal bar was placed in water. The initial volume of water was 89ml.the
final volume was 86ml. What is the volume and density of the metal bar?
3. A rectangular wooden block measures 10cm x 4cm x 5cm. Given the density of
the block is 8.9g/cm?, determine the mass of the block.
4. When a vessel of mass 50g is filled with water, the total mass is 126g. When the
vessel is filled with liquid L. The total mass is 110g.
a. Determine the relative density of the liquid L.
b. Calculate the total mass of the vessel when filled with equal volume of water
and liquid L.
Answer:
alam ko sagot pero mataas
Which is a substance that takes the shape and volume of its container?
amorphous solid
liquid
crystalline solid
gas
The two parents shown in (Figure 1) exert upward forces
of Fi = 18 N on the left end of the plank and F2 = 65 N
on the right end.
How much does the child weigh?
Answer:
W = 83 [N] (weight)
Explanation:
We must clarify that the system is in static equilibrium, in such a way that we must perform a sum of forces on the Y-axis equal to zero, in order to determine the downward force corresponding to the weight of the child.
∑Fy = 0
[tex]F_{1}+F_{2}-m*g=0\\18+65=m*g\\m*g = 83 [N][/tex]
And the mass can be determined as follows:
[tex]m*g=83\\m = 83/9.81\\m=8.46[kg][/tex]
The weight of the child is equal to 83 Newton.
Given the following data:
Upward force 1 = 18 NewtonUpward force 2 = 65 NewtonTo determine the weight of the child:
From the diagram, we can deduce that the system is in static equilibrium. Thus, we would resolve the horizontal component of the forces, in order to determine the downward force (weight of child).
Mathematically, the horizontal component of the forces is given by:
[tex]\sum F_y = 0\\\\F_1 +F_2 -mg=0[/tex]
Substituting the given parameters into the formula, we have;
[tex]18+65-mg=0\\\\83=mg[/tex]
Note: Weight = mg
Weight of child = 83 Newton.
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The speed of sound in water is less than that in air. *
True
False
Answer:
The speed of sound in water is two times slower than that in air. Sound travels much faster in space than in water. Warmer water allows sound to travel faster so i think true
Explanation:
How many neutrons does potassium have?
Answer:
the answer is 20 neutrons
Explanation:
Answer:
20 neutrons
The nucleus of an atom of potassium contains 19 protons and 20 neutrons.
Ms. Perry travels north 5 km, 10 Km west, and then turns and travels 5 Km south. What is her displacement?
Answer:
Her displacement is 10km
Explanation:
An illustrative diagram for the journey is shown in the attachment below.
From the question,
She travels north 5km, which is given by /AB/ in the diagram, and 10km west, which is given by /BC/ in the diagram. She then travels 5km south, which is given by /CD/ in the diagram. To determine her displacement,
Displacement is the shortest distance from an initial position to a final position.
Therefore, her displacement is given by /DA/ in the diagram.
NOTE: /DA/ = /BC/ (Opposite sides of a rectangle)
Since /BC/ = 10km
∴ /DA/ = 10km
Hence, her displacement is 10km.
C
the energy of position or shape
Calculate the Kinetic Energy of a 0.06 kg tennis ball moving at a velocity of 30
m/s *
Kinetic & Potential Energy
KE = { m V? PE = mgh
Quick & Simple!
54
Calculate the potential energy of a 30 kg rock sitting on top of a 12 m shelf
Answer:
27J
3528J
Explanation:
First problem:
Given parameters:
Mass of tennis ball = 0.06kg
Velocity of tennis ball = 30m/s
Unknown:
Kinetic energy = ?
Solution:
Kinetic energy is the energy due to the motion of a body.
It is expressed as:
K.E = [tex]\frac{1}{2}[/tex] m v²
K.E = [tex]\frac{1}{2}[/tex] x 0.06 x 30² = 27J
Second problem:
Given parameters:
Mass = 30kg
Height = 12m
Unknown:
Potential energy = ?
Solution:
Potential energy is the energy due to the position of a body.
Mathematically;
Potential energy = mgh
m is the mass
g is the acceleration due to gravity
h is the height
Now;
Potential energy = 30 x 9.8 x 12 = 3528J
