Question

1) A force of 157 N is applied to a box 25o above the horizontal. If it is applied over a distance of 14.5 m how much work is done?

2) Jamie decides to drop an egg that has a mass of 345 g off the top of a 8.2 m building. How fast will it be falling right before it hits the ground?


3) Snookie is riding in her little red wagon (total mass of 215 kg) at a constant speed of 9.5 m/s. All of a sudden a magenta lemur (19.7 kg) appears in her lap. How fast is the Snook-meister traveling now?


4) Police are investigating an accident. They know that Tom Brady was driving 20 m/s before being hit by Jay Z head on. Tom Brady’s car has a mass of 1100 kg and Jay Z’s has a mass of 1475 kg. They also know that the two cars stuck together and were traveling 7 m/s in the same direction as Jay Z was driving. The speed limit was 25 m/s, was Jay Z speeding?


5) A ball is being swung in a horizontal circle of radius .23 m at a rate of 7.8 m/s. If the ball has a mass of 0.63 kg, find the force of tension on the string.

Answer 1

#1

Work done is given by

`W = F.d cos\theta`

here we know that

F = 157 N

d = 14.5

`\theta = 25^0`

now from the above formula

`W = (157)(14.5)cos25 = 2063.2 J`

#2

By energy conservation

Initial total potential energy of egg = final total kinetic energy of egg

`mgh = (1)/(2)mv^2`

`v = √(2gh)`

`v = √(2(9.8)(8.2))`

`v = 12.7 m/s`

#3

By momentum conservation we know that

`m_1v_1 = (m_1 + m_2)v`

`215(9.5) = (215 + 19.7) v`

`v = (215 (9.5))/(215 + 19.7)`

`v = 8.7 m/s`

#4

by momentum conservation we know that

`m_1v_1 + m_2v_2 = (m_1 + m_2) v`

let direction of velocity of Jay Z car motion is positive direction

now we will say

`1100(-20) + 1475v = (1100 + 1475)(7)`

`1475 v = 2575(7) + 1100(20)`

`v = 27.14 m/s`

Yes Jay Z is overspeeding as his speed is more than speed limit

#5

Tension force in the string will be centripetal force

so here we can say

`T = (mv^2)/(R)`

here we know that

m = 0.63 kg

v = 7.8 m/s

R = 0.23 m

`T = (0.63 (7.8)^2)/(0.23)`

`T = 166.6 N`