Other Physics Answers

Where must an object with respect to a convex mirror with focal length of 30cm, in order to obtain an image one-third as far behind the mirror as the object is in front?

An object 1.00cm high is placed 18.0cm from a converging lens forms a real image 2.00cm high. Calculate the focal length of the lens

1. "Motion is relative” Justify this statement with suitable examples (2 eg)

2. An athlete starts running from the centre of a circular track of radius 7m along the

radius. On reaching the track he runs clockwise along the track upto a point diagonally opposite to his starting point. Calculate the distance travelled and displacement.

3. A ball is thrown vertically upwards to a height h and caught back.What is the

distance travelled and displacement?

4. Which is faster- a car running at 72 kmph or a ball rolling at 25 m/s?

If light rays intercept a plane mirror at an angle of 35° from the vertical to the surface, find the angle between the incident and reflected

An object is placed in front of a convex mirror of focal lenght 15cm. If the image is 10cm from the mirror, calculate the object distace

A man stands 50cm from a concave mirror with radius of curvature 10cm. Find the position of the image and the magnification.

During a flood a tree trunk of mass 100 kg falls down a waterfall.The waterfall is 5 m high.

If air resistance is ignored,calculate:

a.) the potential energy of the tree trunk at the top of the waterfall.

b.) the kinetic energy of the tree trunk at the bottom of the waterfall.

c.) the magnitude of the velocity of the tree trunk at the bottom of the waterfall.

Use the picture of a cart of mass m moving on a roller coaster as well as the accompanying information to answer the following question.The section of track displayed is frictionless and composed entirely of semicircular pieces of radius r.The letters A through E refer to specific locations along the track. if r=12 meters,and if the cart's velocity at point A is 3 meter per second,what is the cart's velocity at point D? Round off your answer to nearest tenth of a meter per second.

A particle has 37.0 joules of kinetic energy and 12.0 joules of gravitational potential energy at one point during its fall from the tree to the ground.An instant before striking to the ground,how much mechanical energy (rounded to the nearest joules) does the particle have? ignore air resistance.

two cars of equal mass(m1=m2=1000 kg) collide.the first car running at 80 km/h while the other car is running at 60 km/h.if hte cars got struck after the collison,with what velocity did the crashed cars move?