Mechanics | Relativity Answers

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where d8 is 4

Find the useful power used in pumping 3425m cube of water per hour from a well 8 metres deep to the surface,supposing 40 percent of the horse power during pumping is wasted.What is the horse power of the engine?

An arrow is fired by an archer at a speed of 5m/s. Its path has the equation of 220st t=−meters after t seconds.

How high does the arrow go and find the speed covered by the rocket when its 3m above the ground?

A child of mass 30 kg States down from the top of the ramphaving a constant slope of 15 degree the child's speed increased from 1.5 metre per second to 3.0 metre per second as series the bottom of the ramp a force of kinetic friction of magnitude 15 Newton opposes the motion draw the appropriate force dragon and determine the length of the ramp take g is equal to 10 metre per second square

A ball of mass

0.1kg,

starting from rest, falls a height of 4.0 m and then collides with

the ground. After the collision, the ball bounces up to a height of 2.0 m. The collision

with the ground takes place over a time

4.0 10 s.

3



Determine (i) the momentum of

the ball immediately before the collision and immediately after the collision and (ii) the

average force exerted by the ground on the ball. Take

10.0 ms .

A comet has an aphelion distance of 6.1 *10power 11 metre and perihelion distance of 5.1*10power 11 metre. The mass of the sun is 2.0*10power 30 kg. Calculate the speed of the comet at the perihelion and the aphelion.

A disc of mass 100 gram slides down from rest on an inclined plane of 30° and comes to rest after travelling a distance of 1m along the horizontal plane.If the coefficient of friction is 0.2 for both inclined and horizontal planes then the work done by the frictional force over the whole journey approximately is (Acceleration due to gravity =10ms^(-2) )

Ans: 0.306J

work done in rotating a handle 1 meter long to 360 degree when a force through of 10 newton is applied at the end off the handle and always perpandicular to it.

Steve is in a car sitting at a stop light. When the light changes he accelerates west until he reaches a speed of 40m/s, which takes 12 seconds. a) What is the acceleration? b) How far did the car travel while accelerating?