1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anon25 [30]
3 years ago
9

By how much does the gravitational potential energy of a 54-kg pole vaulter change if her center of mass rises about 4.0 m durin

g the jump
Physics
2 answers:
kodGreya [7K]3 years ago
8 0
<span>the gravational potential energy of anything on the ground is zero. When calculating potential energy you take height in meters and multiply it by the mass of the object in kilograms and the acceleration of gravity to get a new unit called Joules. Any object at ground level has a potential energy of zero newtons becuase anything multiplied by zero is zero. An object with mass of 54 kg, 4 meters above the ground has a gravitatinal potential energy of 2116.8 Joules.</span>
dexar [7]3 years ago
7 0

Answer:

The gravitational potential energy of pole voulter is 2160\ J.

Explanation:

Given that,

Mass of the pole vaulter, m = 54 kg

Height it rises, h = 4 m

To find,

The gravitational potential energy.

Solution,

We know , gravitational potential energy of an object of mass m and height h is given by m\times g\times h.Here g is acceleration due to gravity=10 m/s^2.

E=m\times g\times h\\=54\times 10 \times 4\ J=2160\ J.

Therefore, the gravitational potential energy of pole voulter is 2160\ J.

Hence, this is the required solution.

You might be interested in
Which activity can be termed as an economic activity?
Lubov Fominskaja [6]

Answer:

Economic activity is the activity of making, providing, purchasing, or selling goods or services.

5 0
4 years ago
An alpha particle
nydimaria [60]

An alpha particle  is identical to a helium nucleus ... 2 protons, 2 neutrons. <em>(1)</em>

6 0
3 years ago
Calculate the amount of work done if you use a 100N force to push a 50kg box 5m across the kitchen floor.
horrorfan [7]

1) B) 500 J

The amount of work done is equal to the product between the force applied (F=100 N) and the distance covered by the box (d=5 m):

W=Fd=(100 N)(5 m)=500 J

2) B)  Tommy had a positive acceleration between noon and 12:30 pm.

In fact, Tommy's velocity increases between noon and 12.30 pm (at noon, he travels at 4 mph, while at 12.30 pm he travels at 6 pm). Since acceleration is equal to the rate of chang in velocity, an increase in velocity means a positive acceleration.

3) C)  The gravitational forces of people is so small it is overshadowed by that of Earth

The magnitude of the gravitational force is given by:

F=G\frac{m_1 m_2}{r^2}

where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between the two objects. From this formula we can understand that the gravitational force exerted by a man on another man is negligible compared to the gravitational force exerted by the Earth on a man, since the Earth's mass is much greater than the mass of a man.

4) C)  Wrestler C

The force due to gravity is equal to the weight of the wrestler: W=mg, where m is the mass of the wrestler and g is the acceleration due to gravity. Since wrestler C has the greatest mass (171 pounds), it has the largest weight, so it experiences the largest force due to gravity.

5) the graph here is missing.

6) the graph here is missing.

7) C)  Carrie is, because velocity includes speed plus direction, and both changed.

An object is accelerating when its velocity changes. But velocity includes both speed and direction: therefore, an object is accelerating when either its speed or its direction is changing. In this example, we are told that Carrie and Sam go up and down in the carousel, therefore their velocity is changing direction, so they are accelerating for sure.

8) C)  Chemical energy changes to mechanical energy.

The energy of the battery is chemical energy, and this is converted into kinetic energy (due to the motion of the fan), which is mechanical energy.

9) A)  Their displacement is the same, zero miles

Displacement is equal to the difference between the final position and the initial position. Since the mile consists of 4 entire laps, it means that the two guys will return at their starting point at the end of the mile: therefore, their displacement is zero.

10) A)  Use an inclined plane of length 8 m.

If we want to use the same effort, we must keep the proportions of the inclined plane the same as in the first example. In the first example, the ratio between the length of the incline and its height is 4:1, and since in the second example the height is increased to 2 m, to keep the same proportions the new ratio should be 8:2, so the length of the inclined plane must be 2 m.

6 0
3 years ago
Read 2 more answers
PLEASE HELP ASAP! WILL GIVE BRAINLIEST TO CORRECT ANSWER! HELP!! HELP!!
Phoenix [80]

Answer:

1. cell membrane

2. golgi body

3. mitochondrion

4. cytoplasm

5. nucleolus

6. nucleus

Explanation:

4 0
3 years ago
Read 2 more answers
"determine the resultant internal loadings acting at the cross sections at points f and g of the frame. set θ = 27º and t = 178
Leviafan [203]

Hi you didn't provide any images to solve the question, hence I am going to solve a different question of same concept so you can have an idea how to tackle such types of questions.(please refer to the attachment for question)

Answer:

<u> Please refer to the attachment for answers and explanation</u>

Explanation:

<u> Please refer to the attachment for answers and explanation</u>

5 0
4 years ago
Other questions:
  • Write a hypothesis about how the height of the cylinder affects the temperature of the water. Use the "if . . . then . . . becau
    14·2 answers
  • Late one night on a highway, a car speeds by you and fades into the distance. Under these conditions the pupils of your eyes hav
    9·1 answer
  • Separating paper from a mixture by burning it is it a physical change true or false
    5·1 answer
  • hello:) I don’t really understand this graph. I thought uniform acceleration means the velocity is constant so it’s a constant g
    9·1 answer
  • A particle moves over the sides of an equilateral triangle if side l with constant speed v
    6·1 answer
  • *****WILL MARK BRAINLIEST WORTH 50 POINTS*****
    12·1 answer
  • A frictionless inclined plane is 6 m long and rests on a wall that is 2 m high.
    6·1 answer
  • 3. A model rocket takes 0.05 seconds to speed up from rest to its maximum velocity of 80 m/s.
    14·2 answers
  • Europa, a satellite of Jupiter, appears to have an ocean beneath its icy surface. Proposals have been made to send a robotic sub
    8·1 answer
  • A tiger has a mass of 34 kg and runs with a speed of 8.5 m/s. what is the kinetic energy of the tiger? (1 point)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!