Physics Answers

A bimetallic strip of iron and Brass is 20mm long at a temperature of 50°C if the strip is uniformly heated to 750°C,find the difference in length between the iron and the Brass (alpha=12×10^-6 _ k-1, alpha=Brass 19×10^-6k-1

A student sees a flash of lightning between a cloud and the Earth. The student estimates the time interval between seeing the flash and hearing the sound of thunder. The time interval is about 6.5m/s. Show that the distance to the thunder cloud is about 2 km.

A moving object slows down its motion from 12m/s to rest at a distance of 20m. Find the acceleration of the object(assumed constant)inside the barrel of the rifle. 

A periodic transverse waves is created by shaking one of a string side to side periodically.ten oscillations are completed in 2.00 seconds.It is known that the wave speed is 2.00 m/s. Calculate frequency of the wave, period of the wave and the wave length

An object placed 5cm in height is placed 10cm from a curved mirror and produces a virtual image of 6.5cm height. Where is the image located and what type of mirror is this

A ball is thrown at an angle of 50 degrees above the horizontal. After 5 s, the ball is at a distance 38 m along the horizontal from the point where it was released. How high is the ball above the point where it was released during this time?

A ball is thrown at an angle of 50 degrees above the horizontal. After 5 s, the ball is at a distance 38 m along the horizontal from the point where it was released. What is the initial velocity of the ball?

An object 5cm high is placed 20cm in front of a concave mirror and produces an image 60cm from the mirror. Find the height of this image

Two blocks A and B are connected by a light flexible chord which passes over a frictionless pulley. The mass of block is 3kg. Block A rests on an inclined plane whose angle of inclination is 35 degrees. What must be the mass of block B so that the system will be in equilibrium? There is no friction anywhere in the system

The electric field has a magnitude of 3.0 N/C at a distance of 30 cm from a point charge.what Is the charge?