1 year ago

A student picks up four books from the floor, walks across the room through some distance with the book

Physics

1 answer:

Marta_Voda [28]1 year ago

8 0

Work is performed while initially lifting books off the floor. The work is due to gravity.

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A 25.0 kg pickle is accelerated from rest through a distance of 6.0m in 4.0s across a level floor . If the friction force betwee

SIZIF [17.4K]

Add the KE increase and the work done against friction.

The final velocity is twice the average, or 3.0 m/s
The final KE is (1/2)*25*3^2 = 112.5 J

The friction work done is 6*3.8 = 22.8 J
hope this is correct

8 0

3 years ago

What is tranlsatory motion? Give two examples

Aleksandr [31]

Answer:

The motion in which all particles of a body move through the same distance in the same time.

Examples: A car moving along the road

A ball rolling on the ground

6 0

3 years ago

What is constant in the horizontal direction for a projectile?

Sergio039 [100]

Answer:

initial velocity is the constant in horizontal projectile

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2 years ago

A kangaroo has a maximum gravitational potential energy during one jump of 770 J

KengaRu [80]

Answer:

k = 44000 N/m

Explanation:

Given the following data;

Maximum gravitational potential energy = 770 J

Elastic potential energy = 14% of 770 J = 14/100 * 770 = 107.8 J

Extension, x = 42 - 35 = 7cm to meters = 7/100 = 0.07 m

To find the spring constant, k;

The elastic potential energy of an object is given by the formula;

$E.P.E = \frac {1}{2}kx^{2}$

Substituting into the equation, we have;

$107.8 = \frac {1}{2}*k*0.07^{2}$

$107.8 = \frac {1}{2}*k*0.0049$

Cross-multiplying, we have;

$215.6 = k*0.0049$

$k = \frac {215.6}{0.0049}$

k = 44000 N/m

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3 years ago

Calculate the acceleration of a bus that speed up from 20ms-1 to 40ms-1 in 8 seconds?

Anastaziya [24]

Answer:

2.5 ms^-2

Explanation:

acceleration

= (final velocity - initial velocity)/time

= [(40m/s) - (20m/s)]/8s

= (20m/s)/8s

= 5/2 m/s²

= 2.5 m/s²

= 2.5 ms^-2

3 0

3 years ago