Physics Answers

determine the kinetic energy of a 125kg roller coaster that is moving with a speed of 20.0 m/s

An electric charge q = +8.31 x 10^-7 C caused an electric field of magnitude E = 63.9 N/C at pt. P. (a) How far is the point P from the charge? (b) If the magnitude of the electric field at pt. P due to this charge is doubled, how far is the point from the charge?

What is the electric charge q when an electric field of 75.8 N/C directed toward the charge can be observed at pt. P which is at a distance of 14.7 m?

Determine the angular velocity ω of the telescope as it orbits around the Sun.

A ball is thrown from the edge of the top of a building with an initial velocity of 80.3 km/hr at an angle of 52.5 degree above the horizontal. The ball hits the ground a horizontal distance of 108 from the base of the building. Assume that the ground is level and that the side of the building is vertical. Calculate the height of the building.

The position of a particle is given by r(t) = -3.1 t i + 0.72 t4 j m, where t is in seconds. At t = 1.9 s, what is the magnitude of the particle’s acceleration?

A man of weight 500N standing on a platform P supported by two light strings passing over two light smooth pulleys A and B supports himself by pulling the string. If the weight of the platform is 1000N, what is the force exerted by the man on the string to keep the platform?

The brakes of a car moving at 14 m/s are applied, and the car comes to a stop in 48 seconds. How far does the car go while it is slowing down from 14 to 10 m/s?

A.13.7 m

B.16.2 m

C.19.5 m

D.26.3 m

A man rides 10 km east and turns 12 km north. How far is he from the starting point?

A.10.36 km

B.12.86 km

C 14.25 km

D 15.62 km

1. What nuclide is formed when 19/10 Ne undergoes beta-plus decay?
2. What nuclide is produced when 234/93 Np undergoes electron capture?