A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece (you can assume the initial velocity to be zero). After the blast, the two masses are moving apart with a relative velocity (vbf –...

A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece (you can assume the initial velocity to be zero). After the blast, the two masses are moving apart with a relative velocity (vbf –...

What is the length (in cm) of a pendulum that has a period of 0.861 s?

How long does it take a child on a swing to complete one swing if her center of gravity is 4.81m below the pivot?

Find the frequency of a tuning fork that take 1.70 x 10-3 s to complete one oscillation.

A child with a weight of 190 N swings on a playground swing attached to 2.00 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest...

In a downhill ski race, surprisingly, little advantage is gained by getting a running start. (This is because the initial kinetic energy is small compared with the gain in gravitational potential...

An athlete with a mass of 64.0 kg is in a cross country race, and at one instant he has a speed of 4.50 m/s. A.) What is his kinetic energy at this instant? B.) If...

How fast (in m/s) must a 2.7-g ping-pong ball move in order to have the same kinetic energy as a 145 g baseball moving at 35.0 m/s?

How much work does a supermarket checkout attendant do on a can of soup he pushes 0.650 m horizontally with a force of 4.90 N? Express your answer in joules and kilocalories.

a.Find the electric field at a point midway between two charges of +43.9 ✕ 10-9 C and +68.2 ✕ 10-9 C separated by a distance of 41.4 cm. N/C in a direction towards the +43...

The photon is normally assumed to have zero rest mass. If the photon did have a tiny mass, this would alter the potential energy the electron feels in the hydrogen atom (due to the Coulomb...

The figure shows Andy, Bella, and Charlie (from left to right) playing on a roundabout. They move the roundabout so that it starts from rest and reaches 4 revolutions in 20.0 s. Assume...

it is a physics question. i think figure out how to solve it. 7.5 * 10^-6

For all the questions below, you are given a motor operated by a 9V battery. The stall torque for this motor is Ts = 0.04 N-m, and its no-load speed, wnl = 2200 rpm. 1. Draw the torque vs...

A car moves through a straight line. The first journey is made in 2 hours at a velocity of 50 km/h and the second journey is made in 1 hour at a velocity of 60 km/h. What is the half time for the...

In a dc circuit, where a power supply connected into a circuit containing an amp meter, when you crank up the voltage of the power supply the reading of the amp meter also increases. With the definition...

A 1.4 kg ball is connected by two strings to a vertical rotating rod. Each of the strings has a length of 1.5 m and is tied to the rod with a separation of 1.8 m. The ball rotates in a horizontal...

For all the questions below, you are given a motor operated by a 9V battery. The stall torque for this motor is Ts = 0.04 N-m, and its no-load speed, wnl = 2200 rpm. 1. Draw the torque vs...

A car can round a banked curve at an 84 m radius and a maximum speed of 16 m/s without relying on friction. What is the angle does the car bank when it turns?

An amusement park ride consists of a vertical cylinder that rotates about its axis. The radius of the cylinder is 2.5m and rotates at a constant speed of 15 m/s. What is the minimum coefficient of...

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