Answer:
h = 10 m
Explanation:
Given that,
Mass of an object, m = 20 kg
It strikes the ground with 1960 J of kinetic energy after falling freely from rest.
We need to find how far above the ground was the object when it was released. Let it is h.
The kinetic energy is converted to potential energy. It can be given by the relation as follows :
[tex]E=mgh\\\\h=\dfrac{E}{mg}\\\\h=\dfrac{1960}{20\times 9.8}\\\\h=10\ m[/tex]
So, it was at a height of 10 m when it was released.
What is the change in gravitational potential energy of the apple if it falls the amount shown? Estimate g to 9.81m/s2 and keep 3 significant figures.
Answer: 1.72J
Just figured this out a while ago
A charged acrylic rod is brought close to a pith ball. The pith ball attracted to the rod, makes contact, and is then repelled by the red. This an example of
A) grounding
B) static discharge
C) induction
D) conduction
E) none of the above
Answer:
It is induction
you do 45.0 joules of work and 3.00 seconds how much power do you use
Answer:
15 watt
Explanation:
Power is the rate at which work is done.
This means you divide the work done with the amount of time used to perform the work.
The formula for Power is : P = W/t where;
W= work done in J = 45
t= time in seconds = 3 sec
P= 45/ 3 = 15 watt
5. This break-dancer's speed is not changing as he spins on his head, but he is
accelerating. Explain how this could be.
The direction of the break dancer is always changing hence we can say that the break dancer is accelerating.
The term acceleration means change of velocity with time. It refers to the time taken for the velocity of a body to change in a specified direction. Recall that velocity takes direction into account.
The direction of the break dancer is always changing hence we can say that the break dancer is accelerating since his direction is changing even though the speed is constant.
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What is the acceleration of a car going 50 mph that slows down to rest over 10 seconds?
Answer:
If the velocity is constant, then there is no acceleration. That is, the value of the acceleration is 0.
Explanation:
108kmh-1 = _____ ms-1
Answer:
30 ms⁻¹
Explanation:
Given:
108kmh⁻¹
Find:
Change into ms⁻¹
Computation:
⇒ 1 km = 1,000 m
⇒ 1 hour = 60 x 60 = 3,600 sec
So,
⇒ 108[1,000/3,600]
30 ms⁻¹
When an object is in a. Gravitas field it has energy in its
Answer:
Explanation:
It is the energy an object has on its virtue of mass.Because the energy acting on the object is working being done to keep that object in the position is it.
2. How important salad dressings in a salad?
Answer:
Well its what makes a salad taste good.
Wood frogs have camouflaged skin so they blend into the background very well.
They also have a layer of mucous on their skin so they can slip away from
predators. What type(s) of adaptations are these?
Answer:
Anti-predator adaptation.
Explanation:
Their habitat is the forest and woodland. Their way of life fits into the anti-predator adaptation but I'm not 100% sure that I'm correct.
Which of the following units would need to be converted before being used for a calculation?
a. m
b. cm
c. 0 ks
d. kg/m3
Explanation:
The fundamental units are such types of units that are not dependent upon any other units. In this problem, we need to find the units that need to be convert before being used for a calculation.
Option (1) m
m stands for meter. It is one of the fundamental unit. It should remains the same.
Option (2) cm
cm stands for centimeter. If a unit is in cm, then it must be converted to meter using the conversion i.e. [tex]1\ cm=100\ m[/tex].
Option (3) ks
ks stands for kilo second. If a unit is in ks, it must be converted to second (s) using the conversion i.e. [tex]1\ ks=1000\ s[/tex].
Option (4) kg/m³
The SIT unit of density is kg/m³. It is unit that is derived from the fundamental unit. It should remains the same.
Answer:
So, the options that need to be converted before being used for a calculation are (b) and (c).
Reference:
brainly.com/question/12750330
A cheetah is running at 25 m/s has a momentum of +170 kg*m/s. What is the mass
of the cheetah? *
Answer:
6.8kg
Explanation:
170/25=6.8
Difference between hydraulic brake and hydraulic lift
Answer:
The hydraulic lift and the hydraulic brake are virtually the same machine. Both of them use some means of applying pressure to a hydraulic fluid that forces a piston or pistons elsewhere to move outward with greater force. There are only two differences between the hydraulic lift and the hydraulic brake. One is that all the push is delivered by one cylinder in a lift and by either two or four cylinders in a brake system. The other difference is that in a hydraulic lift the pump moves the lift piston out in a series of movements while in a brake system the brake pedal moves the brake pistons out in one short movement.
As fluid is forced into the lift cylinder it forces the lift piston upward. The lift cylinder is a lot wider than the pump cylinder. This means that the area of the lift piston is a lot greater than the area of the pump piston. Because Pascal's Principle guarantees that the pressure in a fluid is the same everywhere and the area that pressure is applied over is greater at the lift cylinder, the force applied by the lift cylinder must be greater. The hydraulic lift takes the long low-force motions of the pump piston and converts then into short high-force motions of the lift cylinder.
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Hydraulic brake and Hydraulic lift uses fluid to transmit power from one end to another.
hydraulic brake stops motion and hydraulic lift create motion
The major difference is hydraulic brake used fluid to stop motion, while the hydraulic lift used fluid to create/cause motion that is transport items/persons from one end to another.
Learn more about hydraulic brake and hydraulic lift:
https://brainly.com/question/1747883
Questions 4-6 refer to the following material.
A ball swings freely back and forth in an arc from points I to IV, as shown. Point II is the lowest point
in the path, III is located 0.5 m above II and IV is I m above II. Consider air resistance to be negligible.
IV
111 10.5 m
4. If the potential energy is zero at II, where will the kinetic and potential energies of the ball be equal?
A) At point II
B) At some point between II and III
C) At point III
D) At some point between III and IV
Which box has a larger upward force (normal force) acting on it?
(A) The box of mass 3M
(B) The box of mass M
(C) The two boxes experience equal sized upward normal forces
Answer:
c
Explanation:
I makes the most sense in math. if you put a 3 in the m box it will be the same. So all they did is take out the 3 in the m box
Select each correct answer. More than one answer may be correct.
Which of the following forces between two objects can be repulsive?
gravitational force
magnetic force
electrostatic force
How far is an object from a concave mirror if the image formed is real , enlarged , and inverted ?
If a CFOC was launched and travels 65 meters and is in the air for 3 seconds, what is the launch velocity and angle?
Answer:
Lauch velocity (u) = 26.15 m/s
Lauch Angle (θ) = 35°
Explanation:
From the question given above, the following data were obtained:
Range (R) = 65 m
Time of flight (T) = 3 s
Acceleration due to gravity (g) = 10 m/s²
Lauch velocity (u) =?
Lauch Angle (θ) =?
R = u²Sin2θ /g
65 = u² × Sin2θ /10
Recall:
Sin2θ = 2SinθCosθ
65 = u² × 2SinθCosθ / 10
65 = u² × SinθCosθ / 5
Cross multiply
65 × 5 = u² × SinθCosθ
325 = u² × SinθCosθ .....(1)
T = 2uSinθ / g
3 = 2uSinθ / 10
3 = uSinθ / 5
Cross multiply
3 × 5 = uSinθ
15 = u × Sinθ
Divide both side by Sinθ
u = 15 / Sinθ....... (2)
Substitute the value of u in equation (2) into equation (1)
325 = u² × SinθCosθ
u = 15 / Sinθ
325 = (15 / Sinθ)² × SinθCosθ
325 = 225 / Sin²θ × SinθCosθ
325 = 225 × SinθCosθ / Sin²θ
325 = 225 × Cosθ / Sinθ
Cross multiply
325 × Sineθ = 225 × Cosθ
Divide both side by Cosθ
325 × Sineθ / Cosθ = 225
Divide both side by 325
Sineθ / Cosθ = 225 / 325
Sineθ / Cosθ = 0.6923
Recall:
Sineθ / Cosθ = Tanθ
Tanθ = 0.6923
Take the inverse of Tan
θ = Tan¯¹ 0.6923
θ = 35°
Substitute the value of θ into equation (2) to obtain the value of u.
u = 15 / Sinθ
θ = 35°
u = 15 / Sin 35
u = 15 / 0.5736
u = 26.15 m/s
Summary:
Lauch velocity (u) = 26.15 m/s
Lauch Angle (θ) = 35°
Which circuit does not allow current to flow through it?
A. Circuit D
B. Circuit B
C. Circuit A
D. Circuit C
Answer:
circuit A
Explanation:
because it is not a complete circuit
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Answer:
Circuit A (answer C), does not allow current to flow, because there is no connection between the charge and ground (or positive and negative).
Someone please help!!
Answer:
Infared light
Explanation:
The potential difference between the two terminals on a battery is 9 volts. How much energy is required to transfer 150 coulombs of charge across the terminals?
a. 0.06J
b. 600J
c. 17J
d. 1350J
Answer: 1350J
Explanation:
To solve this, we are going to use the formula for calculating potential difference which is:
Potential difference (V) = Work done (W) / Total charge (C)
Therefore,
9 volts = Work done / 150
Work done = 150 × 9 = 1350J
can anyone tell me what's the base quantities for Force, Pressure and Charge?
Force, pressure, and charge are all what are called derived units. They come from algebraic combinations of base units, measures of things like length, time, temperature, mass, and current. Speed, for instance, is a derived unit, since it's a combination of length and time in the form [speed] = [length] / [time] (miles per hour, meters per second, etc.)
Force is defined with Newton's equation F = ma, where m is an object's mass and a is its acceleration. It's unit is kg·m/s², which scientists have called a Newton. (Example: They used 9 Newtons of force)
Pressure is force applied over an area, defined by the equation P = F/A. We can derive its from Newtons to get a unit of N/m², a unit scientists call the Pascal. (Example: Applying 100 Pascals of pressure)
Finally, charge is given by the equation Q = It, where I is the current flowing through an object and t is how long that current flows through. It has a unit of A·s (ampere-seconds), but scientist call this unit a Coulomb. (Example: 20 Coulombs of charge)
What is the answers of this ! Need help I don’t know what to do
Answer:
1) Mass of Egg Chamber → 35 g = 35 g × 1 kg/(1000 g) = 0.035 kg
2) Average Mass of Grade A Egg → 56.7 g = 0.056 kg
3) Calculated Mass
Drop Chamber + Egg → (35 + 56.7) g = 91.7 g = 91.7 g × 1 kg/(1000 g) = 0.0917 kg
4) Time of Drop → 1.5 seconds
5) Maximum Velocity of Drop Chamber (v = g·t) → v = 9.8 m/s² × 1.5 s = 14.7 m/s
6) Maximum Momentum of Drop Chamber
(P = m·v) (right before hitting the ground) → p = 0.0917 kg × 14.7 m/s = 1.34799 kg·m/s
7) Final End Momentum of Drop Chamber → After landing, velocity v = 0 m/s
(p = m·v after landing) [tex]{}[/tex] ∴ p = m·v = m × 0 m/s = 0 kg·m/s
8) Impulse on Impact → [tex]{}[/tex] (0 - 1.34799) kg·m/s = 1.34799 kg·m/s
(Δm·v = Final - Initial)
9) Force on Impact [tex]{}[/tex] → F·t = Δm·v = 1.34799 N·s
(F·t = Δm·v)
Explanation:
On April 15 1912 the luxury cruise liner titanic sank after running into an iceberg. What was the cruise liners speed when it collided with the iceberg if it has a mass of 4.23 x 10 squared 8 kg ship and a moment of 4.9 x 10 squared 9 kg.m/s
A 2 kg RC car is driving at a speed of 4 m/s. The brakes are hit from the controller and the car slows down to a speed of 2 m/s. What is the work done by friction? *
Answer:
the work done by friction is 12 J.
Explanation:
Given;
mass of the car, m = 2 kg
initial speed of the car, u = 4 m/s
final speed of the car, v = 2 m/s
The work done by friction is equal to change in kinetic energy of the car,
W = ΔK.E
W = ¹/₂m(v² - u²)
W = ¹/₂ x 2 (2² - 4²)
W = -12 J (the negative sign indicates that it is a wasted energy)
Therefore, the work done by friction is 12 J.
an electrical circuit in which the value of resistance is equal to (6 ohms) and the intensity of the current passing through it is (3 amps) the voltage difference between its two is equal to?
Answer:
Voltage difference V = 18 volt
Explanation:
Given:
Resistance R = 6 ohms
Current charge I = 3 amps
Find:
Voltage difference V
Computation:
Voltage difference V = [Current charge][Resistance]
Voltage difference V = 6 x 3
Voltage difference V = 18 volt
2. An object is moving in the positive x-direction while a net force directed along the x-axis is exerted on
the object. The figure shows the force as a function of position. What is the net work done on the object
over the distance shown?
F
FO
o
2d
3d
-Fof
A) Fid
B) Ford
C) 2Fd
D) 4F,
Answer:
A. F₀d
Explanation:
The formula for work done on an object is given by:
w= f*d
Work done towards the positive direction is given by ;
Work done under the trapezoid shaped area:
1/2 {a+b} h = 1/2 { 2d + d } F₀
W=3/2dF₀
Work done on the triangle shaped part
W= 1/2 * b * h
W= 1/2 * d * -F₀ = -1/2dF₀
The net work done :
3/2dF₀ -1/2dF₀ = 1dF₀
what does x repressent on a motion map?
Answer:
The x represents the reference point on a motion map
Explanation:
-Motion maps are another way to represent the motion of an object. (other representations are graphical and mathematical models)
Answer:
The x represents the reference point on a motion map. Explanation; -Motion maps are another way to represent the motion of an object. (other representations are graphical and mathematical models).
Explanation:
Making good lifestyle choices will prevent all diseases.
Please select the best answer from the choices provided.
T or F
Answer:
False.
Explanation:
A good health can be defined as the state of well-being in which all of the components of an individual's health are in balance. These state of well-being comprises of six (6) important components and they are;
1. Physical: this is a measure of the state of an individual's body or the way the body functions. It is enhanced by eating right, working out or exercising, avoiding drugs and alcohol, maintaining a good body mass index etc.
2. Emotional: this deals with the state of an individual's mind being void of worries, negativity etc.
3. Social: this involves keeping a good relationship with friends, family and many others around.
4. Environmental: it deals with maintaining a hygienic surrounding, that is devoid of pollutants.
5. Mental or intellectual: avoiding unnecessary stress and anxiety while dealing or coping with the realities of life.
6. Spiritual: it encompasses belief systems, values, ideals, morality etc.
When an individual is able to balance all of these above mentioned components, then he or she is said to be healthy.
Hence, making good lifestyle choices will not and cannot prevent all diseases because some diseases are hereditary in nature i.e they can be transferred from a parent to their offspring or generation to another through genetics. Some examples of hereditary diseases are haemophilia, sickle-cell anaemia, thalassemia, cystic fibrosis, etc.
Answer:
false on edge
Explanation:
A soccer player pumps air into a soccer ball until no more air can be pushed inside. Describe the air inside the soccer ball compared to the air outside the ball. (Use the word "particle" in your explanation.)
Answer:
the filling stops when the pressure of the pump equals the pressure of the interior air plus the pressure of the walls.
Explanation:
This exercise asks to describe the inflation situation of a spherical fultball.
Initially the balloon is deflated, therefore the internal pressure is equal to the pressure of the air outside, atmospheric pressure, when it begins to inflate the balloon with a pump this creates a pressure in the inlet valve and as it is greater than the pressure inside, the air enters it, this is repeated in each filling cycle, manual pump.
When the ball is full we have two forces, the one created by the external walls and the one aired by the pressure of the pump, these forces are directed towards the inside, but the air molecules exert a pressure towards the outside, which translates into a force. When these two forces are equal, the pump is no longer able to continue introducing air into the balloon.
Consequently the filling stops when the pressure of the pump equals the pressure of the interior air plus the pressure of the walls.
what is meant by lateral inversion
Answer:
Explanation:
Lateral inversion is a phenomenon where the right seems to be on the left and left seems to be on the right.It occurs due to the direction is reflecting of a direct surface.An example of this is a mirror/window.A mirror is a better example to explain this! Hope this helps lemme know if u dont
