Question
Asked Dec 17, 2019
11 views

A 50. - kg pole vaulter running at 10. m/s vaults over the bar.
Her speed when she is above the bar is 1.0 m/s. Neglect air
resistance, as well as any energy absorbed by the pole, and
determine her altitude as she crosses the bar.

check_circle

Expert Answer

Step 1
help_outline

Image Transcriptionclose

Given Info: The mass of the pole vaulter is 50.0 kg. The initial speed of the athlete is 10.0 m/s. The speed of the athlete when she is above the bar is 1.0 m/s. Since, the air resistance and any energy absorbed by pole are neglected;

fullscreen
Step 2
help_outline

Image Transcriptionclose

Since, the air resistance and any energy absorbed by pole are neglected; The total energy of the athlete before valts over the bar is only the kinetic energy of the athlete. Thus, E; = mv;? + 0 • mis the mass of the athlete • v; is the initial velocity of the athlete The total energy of the athlete after she valts over the bar is the sum of the kinetic energy of the athlete and the potential energy too. So, E; = mv}? + mgh vz is the velocity of the athlete when she valts over the bar gis acceleration due to gravity • his the altitude of the athlete as she crosses the bar

fullscreen
Step 3
help_outline

Image Transcriptionclose

Now, using conservation of mechanical energy, on combining equation (I) and (II), mv;? = mv;? + mgh On re-arranging, v;²_v² 2g

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Physics

Related Physics Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Emily challenges her husband, David, to catch a $1 bill as follows. She holds the bill vertically as...

A: Write the distance travelled

question_answer

Q: A ball is projected horizontally from the top of a building. Onesecond later, another ball is projec...

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and s...

question_answer

Q: Can you physically touch a person without that person touchinh you with same amount of force?

A: According to Newton's third law,For every action, there is an equal and opposite reaction.

question_answer

Q: A person takes a trip, driving with a constant speed of 89.5km/h, except for a 22.0-min rest stop. I...

A: Formula to calculate the total time elapsed is,

question_answer

Q: Thre e objects are connected on a table as shown in Figure P4.73. The т coefficient of kinetic frict...

A: The below diagram represents the free body diagram of mass m2.

question_answer

Q: I don’t know the answer

A: Given:Mass of the block (m) = 3 kgForce applied on the block (F) = 2 NForce applied for time (t) = 6...

question_answer

Q: A mountain climber stands at the top of a 50.0 - m cliff thatoverhangs a calm pool of water. She thr...

A: Click to see the answer

question_answer

Q: Two forces are applied to acar in an effort to move it,as shown in Figure P4.12.(a) What is the resu...

A: Given

question_answer

Q: A horizontal force of 150 N is used to push a 40.0 - kg packingcrate a distance of 6.00 m on a rough...

A: Formula to calculate the work done by the force is,