Mechanics | Relativity Answers

A pendulum bob of mass 50 g is suspended on a string from the ceiling of an elevator which is moving downwards with an acceleration 1.5 ms−2. Draw the free body diagram using the non-inertial frame of reference and determine the tension in the string. (Take g = 10 ms−2) (5)
b) What should be the radius of a space station spinning with an angular speed of 2 rpm such that an astronaut inside the station experiences artificial gravity with g = 10 ms−2?

Very high in the earth's atmosphere, the temperature can be as high as 700 degrees Celsius, yet an animal there would freeze to death rather than roast. EXPLAIN

A truck of mass 2000 kg moving on a highway experiences an average frictional force of 800 N. If its speed increases from 25 ms-1 to 35 ms-1 over a distance of 500 m, what is the force generated by the truck.

A 5.5kg rifle fires an 11gram bullet with a velocity of 1000m/s. a. Find the velocity of a rifle? b. if the shooter holds the rifle firmly with his shoulder what will be the velocity assume the mass of shooter is 120kg?

Antarctica is roughly semicircular, with a radius of 2.00­103 km (see the figure). The average thickness of its ice cover is 3.00­103 m. How many cubic centimeters of ice does Antarctica contain? (Ignore the curvature of Earth.)

we have a ping pong ball with r=3 cm and density = 85 kg/m3.calculate the force that acts on the ping pong ball and it is keeping that under water.density of water = 1000 kg/m3

Consider two cylindrical pipes of equal length. One of these acts as a closed organ pipe and the other as open organ pipe. The frequency of the third harmonic in the closed pipe is 200 Hz higher than the first harmonic of the open pipe. Calculate the fundamental frequency of the closed pipe.

A stretched string of mass 20 g vibrates with a frequency of 30 Hz in its fundamental mode and the supports are 40 cm apart. The amplitude of vibrations at the antinode is 4 cm. Calculate the velocity of propagation of the wave in the string as well as the tension in it.

The linear density of a vibrating string is 1.3 × 10^-4 kg m1. A transverse wave is propagating on the string and is described by the equation y (x, t) = 0.021 sin (30t - x) where x and y are in metres and t is in seconds. Calculate the tension in the string.

The linear density of a vibrating string is 1.3 × 104 kg m1. A transverse wave is propagating on the string and is described by the equation y (x, t) = 0.021 sin (30t x) where x and y are in metres and t is in seconds. Calculate the tension in the string.