1 year ago

What is the relationship between speed and kinetic energy?

2 answers:

7 0

Answer:

Kinetic energy depends on the velocity of the object squared. This means that when the velocity of an object doubles, its kinetic energy quadruples.

Snowcat [4.5K]1 year ago

5 0

Answer:

The greater the speed of an object, the more kinetic energy it has.

Explanation:

Hope this helps! <3

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A 75.0-kg cross-country skier is climbing a 3.0° slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N.

sweet-ann [11.9K]

Answer:

a) 12.01 W

b) 63.506 N

c) 11.82 s

Explanation:

Given data:

mass = 75 kg

slope of inclination = 3 degree

speed of skier is 2.00 m/s

air Resistance = 25 N

a) From the given information we have following relation

$F_n = mgsin\theta + F_a$

$F_n = 75\times 9.81 sin 3 + 25 = 63.506 N$

Power output

$P =F_n \times v$

$P = 63.506 \times 2 = 127.01 W$

b) average force can be calculate as

$F_n = mgsin\theta + F_a$

$F_n = 75 \times 9.81 sin 3 + 25$

F_n = 63.506 s

force of acceleration is f = ma

solving for acceleration

$a = \frac{F}{m}$

$a = \frac{63.506}{75}$

a = 0.846 m/s^2

we know acceleration is given as $a =\frac{v -u}{t}$

solving for time t

$t = \frac{v-u}{a}$

$t =\frac{10-0}{0.846}$

t = 11.82 s

4 0

3 years ago

Concept Simulation 2.3 provides some background for this problem. A ball is thrown vertically upward, which is the positive dire

KATRIN_1 [288]

Answer:

39 m/s

Explanation:

Hi!

The equation of motion of the ball is:

$y(t) = y_0 + v_{0y}t-(1/2)(9.8 m/s^2)t^2$

Where y_0 is the initial horizontal position, which we will take as zero.

v_0y is the initial velocity and t is the time

To find the initial velocity we will set y(7.96s) = 0

$0 = v_{0y} (7.96 s)-(4.9 m/s^2)(7.96 s)^2\\v_{0y} =(4.9 m/s^2) (7.96 s)\\v_{0y}=39.004 m/s$

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Answer:

Explanation:

A atomic number is the addition of every number

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3 years ago

Please help thank you

Valentin [98]

Diagram A is the correct diagram

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Read the scenario, then answer the questions. a 2 kg ball is thrown upward with a velocity of 15 m/s. what is the kinetic energy

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Both answers are 225 J

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