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
Nikolay [14]
3 years ago
10

A basketball player jumps straight up for a ball. To do this, he lowers his body 0.310 m and then accelerates through this dista

nce by forcefully straightening his legs. This player leaves the floor with a vertical velocity sufficient to carry him 0.940 m above the floor. (a) Calculate his velocity (in m/s) when he leaves the floor. m/s (b) Calculate his acceleration (in m/s2) while he is straightening his legs. He goes from zero to the velocity found in part (a) in a distance of 0.310 m. m/s2 (c) Calculate the force (in N) he exerts on the floor to do this, given that his mass is 106 kg. N
Physics
1 answer:
Nastasia [14]3 years ago
8 0

Answer:A)u =4.295m/s  , B)a = 29.746m/s²   C) F=3,153N

Explanation:

Using the kinematic expression  

v² = u² - 2as

where

u = initial velocity

v = final velocity

s = distance

g = acceleration due to gravity .

Given that he reaches a height of 0.940 m above the floor,

the final velocity  = 0

Here, acceleration due to gravity is acting in  opposite the initial direction of motion. So, a=-9.81 m/s.

v² = u² + 2as

0² - u² = 2 (- 9.81) × 0.940

- u² = 2 × - 9.81 × 0.920

- u² = -18.4428

cancelling the minus in both sides , we have that  

u² = 18.4428

u = √18.4428

u =4.295m/s

(b) His acceleration (in m/s2) while he is straightening his legs. He goes from zero to the velocity found in part (a) in a distance of 0.310 m. m/s2

Using v² = u² + 2as

where u = initial speed of basketball player before lengthening = 0 m/s,

v = final speed of basketball player after lengthening =  4.295m/s,

a = acceleration while  straightening his legs

s = distance moved during lengthening = 0.310m

v² = u² + 2as  

 a = (v² - u²)/2s

a = (4.29m/s)² - (0 m/s)²)/(2 × 0.310m)

a = (18.4428 m²/s² - 0 m²/s²)/(0.62 m)

a = (18.4428 m²/s²/(0.62 m)

a = 29.746m/s²

c) The force (in N) he exerts on the floor to do this, given that his mass is 106 kg. N

Force= mass x acceleration.

F = 106 kg X 29.746m/s²

 F = 3,153.076 rounded to  3,153N

You might be interested in
A less common type of radioactive particle emitted is the positron. If potassium-38 forms argon-38 by positron emission, the num
aleksandr82 [10.1K]
Potassium goes to argon so that a proton in the K nucleus "vanishes" into a positron (positive electron ?) but keeps the same atomic mass at 38. ? I'd say that the number of the positron was 0, and the charge was +1 electronic charge.
4 0
3 years ago
The atomic particle that has a charge opposite to that of an electron is called a
Flura [38]
A proton (+).
It is the opposite to an electron.
8 0
3 years ago
Water flows over a section of Niagara Falls at the rate of 1.2×106 kg/s and falls 50.0 m. How much power is generated by the fal
quester [9]

Answer:

5.88×10⁸ W

Explanation:

Power = energy / time

P = mgh / t

P = (m/t) gh

P = (1.2×10⁶ kg/s) (9.8 m/s²) (50.0 m)

P = 5.88×10⁸ W

7 0
3 years ago
A student pulls a cart across the floor with a force of 45 N. If the cart travels 10 m, how much work does the cart do on the st
bixtya [17]
I'm assuming we're applying the standard Integral form of the calculation of work. The solution is provided in the image.  

6 0
3 years ago
The chart shows data for an object moving at a constant acceleration. Which values best complete the chart? Time (s) Velocity (m
dangina [55]

Answer:

A.

x: 0

y: 0

z: 0

Explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • How is force, work, and distance the related
    9·1 answer
  • If we wanted to increase the internal energy of the system by 10 J, we could...
    15·1 answer
  • A ball moving horizontally across my desk rolls off at a velocity of 3.3 m/s. Assuming my desk is a height of 0.81 m, how long w
    5·1 answer
  • Why people won’t want to live near wind turbines.
    15·2 answers
  • What is the mass number of the isotope lithium-7??
    15·2 answers
  • the electromagnet shown in the image has a wire coiled 5 times around a nai. it can lift up to 7 metal paper clips. What two cha
    13·2 answers
  • EVERYONE BE AWARE IF YOU GET SENT SOMETHING LIKE THIS (Answer is in the photo. I can only upload it to a file hosting service. l
    7·1 answer
  • Which force below does the most work? All three displacements are the same. The 10 N force. The 8 N force The 6 N force. They al
    15·1 answer
  • A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket
    9·1 answer
  • What is the force needed to accelerate a wagon with a mass of 10 kg at a rate
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!