Physics Answers

Two equally charged particles are held 3.2×10-3 m apart and then released from rest. The initial acceleration of the first particle is observed to be 7.0 m/s2 and that of the second to be 9.0 m/s2. If the mass of the first particle is 6.3 x l0-7 kg, what are (a) the mass of the second particle and (b) the magnitude of the charge of each particle

Sarah (m=81.2 kg) is traveling at a speed of 18.1 m/s at the top of a 11.5 m high roller coaster loop. Determine Sarah's speed at the bottom of the loop. Include a diagram 

Nolan Ryan reportedly had the fastest pitch in baseball, clocked at 100.9 mi/hr (45.0 m/s) If such a pitch had been directed vertically upwards at this same speed, then to what height would it have traveled (in meters)? 

A bicycle has a kinetic energy of 124 J. What kinetic energy would the bicycle have if it had …

… three times the mass and was moving with one-half the speed?

Answer 1

… twice the mass and was moving at the same speed?

Answer 2

… the same mass and was moving with twice the speed?

Answer 3

… one-half the mass and was moving with twice the speed?

Answer 4

… the same mass and was moving with one-half the speed?

Calculator the acceleration on a 2.5 x 10^6 kg rocket if the net thrust of the rocket 2.8 x 10^7 N.

A bicycle of mass 14.6 kg and a rider of mass 50 kg generate a net force of 12 N. how fast are they going after 2.0s?

A net force of 200 N is applied to a large object, causing its velocity to change from 30km/h to 20 km/h in 2.3 seconds. What is the objects acceleration? What is its mass?

Two point charges of 0.04 x 10^-6 C and 0.16 x 10^-6 C are 20 cm apart in air. What is the potential energy of the system?

Find the spring constant k if the spring is stretched a distance 47 m by a suspended weight 19 N. The acceleration of gravity is 9.8 m/s^2. Answer in units of N/m.

A 20 kg brick stands upright on the ground as shown. What is the pressure it exerts on the ground? 10cm x 20cm x 5cm