pakilina

A body slides down a curved track which is one quadrant of a circle of radius R. If it starts from rest at the top of the track and there is no friction, find the speed at the bottom of the track is R equals 5 m.

13 years ago

Your electricity usage for a one month period is 500 kilowatt-hours. Assuming one month is equal to 30 days and that the electricity usage is uniform across the whole month, what would be the velocity of a 1 kg mass if it was given the kinetic energy equi...

13 years ago

A 2 kg block is pushed 2 m along a fixed horizontal surface by a horizontal force of 20 N. The coefficient of kinetic friction of the surface is µk= 0.40. (a) How much work is done by the 20 N force? (b) what is the work done by the friction force? (c) Wh...

13 years ago

A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 m above the street level. (a) How many joules of work has he done? (b) By how much has he increased his potential energy? (c) If he climbs the stairs in 2...

13 years ago

A 60 kg skydiver moving at terminal speed falls 50 m in 1 sec. What power is the skydiver expending on the air? The terminal speed of the falling object is the maximum constant speed the object will reach due to the opposing force of air resistance.

13 years ago

A piano of mass 800 kg is hoisted up to a 15 meter height. Just then, the rope breaks with the piano plummeting down to the ground. What is the velocity of the piano when it strikes the ground?

13 years ago

A wheel is turning at a speed of 2.0 rev/sec and is allowed to coast to rest. If it does so in 30 sec, how far did it turn in the process? Assume uniform acceleration.

13 years ago

A wheel with 50 cm diameter is moving at a speed of 20 m/sec. (a) How fast is the wheel turning? (b) How many revolutions will the wheel turn if it coasts uniformly to rest in 30 sec?

13 years ago

A ball of mass m is rotated at constant speed v in a vertical circle of radius r as shown below. Find the tension in the cord when the ball is at position A and position B. (Position a is in top of the wheel, position B is on the bottom of the wheel, 180...

13 years ago

A solid ball of radius b and mass m is released from the top of an incline of the incline is at the height h above the ground. If the ball rolls without slipping, what willl be its linear speed when it reaches the botton of the incline?

13 years ago

The moment of inertia of a 0.98 kg bicycle wheel rotating about its center is 0.13 km-m^2. What is the radius of the wheel? Ignore the mass of the wheel's spokes.

13 years ago

A torque of 0.97 N-m is applied to a bicycle wheel of radius 0.35 m and mass 0.75 kg. Treating the wheel as a hoop, find its angular acceleration.

13 years ago

The charged plates of a parallel plate capacitor each have a charge density of sigma C/m^2. Using Gauss's law, compute the electric field between the plates.

13 years ago

A graphite rod is 1.0 m long, with a 1.0 cm by 0.5 cm rectangular cross sectional area. What is the electrical resistance between its long ends? What must be the diameter of a circular 2.0 m long copper rod if its resistance is to be the same?

13 years ago