Physics Answers

A parachutist of mass 70kg falls out of an aeroplane from a height of 2000m and falls under gravity until 600m from the ground when he opens his parachute. The parachute provides a resistance of 2330N. Find the speed at which the parachutist is travelling when he reaches the ground.

A solid sphere is rolling on a rough horizontal surface with linear speed v . It collides with a vertical wall elastically. Coefficient of friction on each surface is 0.5 .Find speed of sphere when it again starts rolling without slipping.

Describe how the equipment can be used to find the power of another battery charger.

The equipment is: power supply, clock, battery charger, joulemeter and battery,

The speed c of ocean wave is proportional to the acceleration due to gravity g, wavelength λ, and density ρ of the wave such that c = kg^xλ^yρ^z,  where k is a dimensionless constant. What is the correct equation for the speed of the ocean?

A particle performs linear SHM of amplitude 5 cm at what displacement from its mean position will the potential energy of the particle be 20% of the total energy

 Stacked Blocks F т, m2 no friction Consider two blocks that are resting one on top of the other. The lower block has mass = 2.2 frictionless table. The upper block has mass m kg. Suppose the coefficient of static friction between the two blocks is given by 4.8 kg and is resting m2= on a = 0.5 A force of magnitude F is applied as shown. What is Fmaz, the maximum value of F for which the upper block can be pushed horizontally together without slipping? Please give your answer in Newtons. so that the two blocks move

i ) Describe any 4 natural/ industrial processes of adiabatic compression and

adiabatic expansion.

ii ) State how entropy changes are linked with Air pollution in modern world.

iii ) Describe the difference between capacitor and a capacitance. Also state the basic relation between frequency and capacitance.

Expert's answer

A warning buzzer is to sound when the following conditions occurs a)A or B are up b)A,C and D are up c) B,C and D are up d)B or D are up

a) The student helps his parents to change the tires of the car. How much torque can a student produce with a 30 cm long ring iron when pushing the iron down with its full weight to open the tire mounting bolt? The student weighs 60 kg. 

b) If the tire mounting bolt does not open, a tube can be used as an extension arm, which is placed as an extension of the ring iron arm. How much torque does the student achieve if the arm of the ring iron is now 130 cm long?

The gymnast supports a 20 kg dumbbell as shown. Calculate how much force the biceps muscle applies to the forearm of the forearm. The attachment point of the biceps in the spindle is 5 cm and the center of the dumbbell is 30 cm from the elbow joint. The own weight of the forearm does not need to be considered.