Impulse

A 300 g bass ball traveling a 30m/s is struck by a bat in the direction from which it cam at 40 m/s. What is the impluse fo the force on the base ball?

Rotational speed

The crankshaft of an engine is accelerated from res to the uniform rate of 4.0 rad/s^2 for 30 s. What is the rotational slpeed of the crankshaft a the end of 30 s in rev/min?

Mass of a log

A log of wood is floating in water with 40% of its volume above the surface of the water. If the volume of the log is 0.4 m^3, what is the mass of the log?

What are the coordinates of the third mass of 3.0 kg?

The center of mass of three objects is located a (1,0). one object with a mass of 5.0 kg is at (-2,-1) and a second object with a mass of 2.0 kg is at (0,0). What are the coordinates of the third mass of 3.0 kg?

Rotational inertia

A uniform solid sphere of mass 5 kg and radius fo 30 cm is rotating about an axis through its centor at a rate of 180 rev/min. Find the kinetic energy of te sphere. the rotational inertia of the sphere is 2/d MR^2.

Mass of a particle

The magnitude of the momentum of a particle is 32 kg.m/s at a certain instant. if the velocity has a magnitude of 20 m/s at that instant, the mass of the particle is what?

Height of a tank

Water is pumped through a pipe to a tank at the top of a building. The pressure of the water at ground level 2.2*10^5 Pa and at the tank, the pressure is atmospheric. If the diameter of the pipe is the same throughout, find the hieght at wich the tank is located. Atmospheric pressure may be assumed a 1.0*10^5 Pa and g as 9.8 m/s ...continues

Elongation of a rod.

A force 1.0*10^3 N is applied to a steel rod of lenght 1 m and a circular cross section of the are 10 cm ^2. Find the elongation of the rod. Young's modulus for steel is 2.0*10%11 Pa.

Venturi meter

What is the priciple on which a venturi meter works?

Rate of rotation

A star rotates about its axis through a diameter once in 50 days. At the end of its life the star collapses to one hundredth of its orginal diameter. What will the rate of rotation of the collapsed star be?