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
krek1111 [17]
2 years ago
10

A 20-kg boy slides down a smooth, snow-covered hill on a plastic disk. The hill is at a 10° angle to the horizontal, and the slo

pe is 50 m long. Part A If the boy starts from rest, what is his speed at the bottom of the hill?​
Physics
1 answer:
zvonat [6]2 years ago
7 0

Answer:

13 m/s

Explanation:

I assume we are ignoring friction.

The boy's PE will all be converted to KE at the bottom of the hill.

to find PE = mgh   we need to know h

   h = 50 sin 10 = 8.68 meters

     then:    PE = 20 * 9.81 * 8.68 =<u> 1703.49</u> j

KE = 1/2 m v^2 = <u>1703 .49</u>

            v = 13 m/s

You might be interested in
What is the formula for kinetic energy
coldgirl [10]

Answer:

The formula for kinetic energy is K.E. = 1/2 mv 2 , where "m" stands for mass and "v" stands for velocity. Kinetic energy is typically measured in units of Joules, and 1 Joule is equal to 1 kilogram-meters squared per second squared.

Explanation:

8 0
3 years ago
Read 2 more answers
A family car has a mass of 1400 kg. In an accident it hits a wall and goes from a speed of 27 m/s to a standstill in 1. 5 second
madreJ [45]

The force involved is = 25200 Newton

Given the values in the questions,

Mass = 1400 kg

Speed or velocity of the car = 27 m/s

Time is given = 1.5 seconds

According to the formula of force,

⇒ Force = Mass x Acceleration

⇒ Force = 1400 x Acceleration ----- equation 1

Now to calculate the value of acceleration we will use,

⇒ Acceleration = (Velocity or Speed) / Time

⇒ Acceleration = 27 / 1.5

⇒ Acceleration = 18 m/s^{2}

Putting the value of acceleration in equation 1,

⇒ Force = 1400 x 18

⇒ Force = 25200 Newton

Therefore, the force involved is = 25200 Newton

To learn more about Force,

brainly.com/question/13191643

#SPJ4

8 0
1 year ago
1. What types of gas was the first atmosphere made out of?
sergij07 [2.7K]
17. a sea breeze is a breeze blowing towards the land
18. a land breeze is a breeze blowing towards the sea
8 0
3 years ago
Read 2 more answers
un astronauta cuya masa es 80kg permanece inmovil en el espacio exterior, al activar la unidad propulsora que lleva en la espald
beks73 [17]

Answer:

Explanation:

80(0) = 2(15) + (80-2)v

v = - 0.38 m/s

5 0
3 years ago
Who’s of the following is classified as a salt: ammonia or sodium chloride?
Temka [501]

Sodium Chloride could be classified as a salt.

8 0
3 years ago
Other questions:
  • Write a sentence or short paragraph that defines and explains an adaptation
    6·1 answer
  • The spring is now compressed so that the unconstrained end moves from x=0 to x=L. Using the work integral W=∫xfxiF⃗ (x⃗ )⋅dx⃗ ,
    6·1 answer
  • 4. While broadcasting a football game, the announcer exclaimed, "I can't believe it. Carl James just scored a touchdown. That's
    14·2 answers
  • Why the substance on the periodic talbe classified together​
    13·2 answers
  • Contrasting the Doppler effect with shock waves, the one that requires the faster source is?
    9·2 answers
  • When the palmaris longus muscle in the forearm is flexed, the wrist moves back and forth. If the muscle generates a force of 43.
    14·1 answer
  • A simple pendulum with length L is swinging freely with
    6·1 answer
  • What is mummification?
    8·2 answers
  • Which statement describes a controlled experiment?
    6·1 answer
  • When you look at yourself in the mirror, what is the approximate angle of incidence of the light rays?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!