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
qwelly [4]
3 years ago
7

By what mechanism is a person injured when he or she falls from a significant height? Select one: a. Kinetic energy is converted

to potential energy; the potential energy is then converted into the work of bringing the body to a stop. b. As the person falls, the amount of kinetic energy is converted into work; work is then converted to kinetic energy upon impact. c. Potential energy is created as the person is falling; the potential energy is then converted into kinetic energy upon impact. d. Potential energy is converted to kinetic energy; the kinetic energy is then converted into the work of bringing the body to a stop.
Physics
1 answer:
pashok25 [27]3 years ago
6 0

Answer:

d. Potential energy is converted to kinetic energy; the kinetic energy is then converted into the work of bringing the body to a stop

Explanation:

- When the person starts his/her fall from a certain height h, he/she possesses gravitational potential energy:

U=mgh

where m is the mass of the person, g is the acceleration due to gravity, h is the height.

- During the fall, the height h decreases, while the speed of the person increases, so gravitational potential energy is converted into kinetic energy:

K=\frac{1}{2}mv^2

where

m is the mass of the person

v is the speed

- Just a moment before hitting the ground, h=0, so all the potential energy has been converted into kinetic energy

- When the person hits the ground, he/she comes a stop: this means that now the speed is zero (v=0), so the kinetic energy is zero as well. This occurs because all the kinetic energy has been converted into the work of bringing the body to a stop. (the work has been done by the ground on the person)

You might be interested in
Projectile motion 1 and 2​
shtirl [24]

1. Vf =62.57778m/s

h=62.5778

theta final=45°????

8 0
3 years ago
A car is stationary. It accelerates at 0.8 ms^2
lara31 [8.8K]

Answer:

the car’s final displacement is 60 m

Explanation:

Given;

initail velocity of the car, u = 0

acceleration of the car, a = 0.8 m/s²

time of motion, t = 10 s

The first displacement of the car:

x_1 = ut + \frac{1}{2} at^2\\\\x_1 = 0 + \frac{1}{2} (0.8)(10)^2\\\\x_1 = 40 \ m

The second displacement of the car;

acceleration, a = 0.4 m/s²,   time of motion, t = 10 s

x_2 = ut + \frac{1}{2} at^2\\\\x_2 = 0 + \frac{1}{2} (0.4)(10)^2\\\\x_2 = 20 \ m

The final displacement of the car;

x = x₁  +  x₂

x = 40 m  +  20 m

x = 60 m

Therefore, the car’s final displacement is 60 m

8 0
2 years ago
Select the correct answer. Which feature of a wave determines its color in the visible spectrum? A. Amplitude B. Composition C.
dexar [7]

Answer:

D. Wavelength

Explanation:

Explanation: the colour of visible light depends on the wavelength of the wave. The visible light spectrum goes approximately from wavelength of 380 nm (corresponding to violet light) to 750 nm (corresponding to red light), and the different colours in between correspond to different wavelengths.

4 0
2 years ago
What's the difference between a tornado and a hurricane?
Scilla [17]

Answer:

hurricanes last longer that tornadoes

6 0
2 years ago
Read 2 more answers
DUE TONIGHT HURRY PLS I give 30 pts
Paha777 [63]

The answer is both.

For kinetic energy:

KE = 1/2*m*v^2 = 0.5*20,000 grams*5 = 50,000 J

For gravitational potential energy:

Pe = mgh = 20,000 grams*9.81 m/s^2*2 m = 392.2 J      

6 0
3 years ago
Other questions:
  • What would happen if the moon was hit by an asteroid
    6·1 answer
  • The precipitator uses a high voltage DC power supply to provide a set of wires with a positive charge and a set of plates with a
    11·1 answer
  • He specific heat of Aluminum is 0.9 J/g K. The specific heat of Copper is 0.39 J/g K. If samples of equal mass of both Aluminum
    15·2 answers
  • A 10-ft ladder is leaning against a wall. If the top of the ladder slides down the wall at a rate of 2 ft/sec, how fast is the b
    12·1 answer
  • What is a heat pump? Why does it need to put in external work? Help ASAP!
    14·2 answers
  • Kinetic Friction force is always less than Static Friction force.
    5·1 answer
  • Calculate the index of refraction for a medium in which the speed of light is 2.1x 108 m/s. The speed of light in vacuum is 3x10
    9·1 answer
  • Football is kicked at 23.4 m/s at a 38.5 angle. How far away does it land?
    7·2 answers
  • 3. Assume that a sample decays with a given half-life. Will you be able to observe when the sample has completely decayed? Why o
    6·1 answer
  • A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!