Physics Answers

A 0.30 kg metal ball at a velocity of 3.0 m/s hits another metal ball with a mass of 0.20 kg which is at rest. What is the velocity of the 0.20-kg metal ball if the velocity of the 0.30-kg metal ball became 2.0 m/s after the collision? Use: p before the collision (m₁v₁ + m₂v₂) = p after the collision (m₁’v₁’ + m₂’v₂’)

A particle moves with a displacement function 12.5+t^2, calculate the acceleration of the body

A concave mirror has a focal length of 0.50 m.

if an object produces a virtual image 0.09 m from the mirror, where is it located?

1. Two resistors, R₁ = 00 kΩ and R₂ = 3.00 kΩ, are connected in parallel and their combination is connected in series to a fully charged, 150-µF capacitor. When the switch is opened, the capacitor begins to discharged. What is the time constant for the discharge?  

A projectile is fired in a way that its horizontal range is equal to three times its maximum height .What is the angle of projection?

An austranaut on a strange planet finds that she can jump a maximum horizontal distance of 15m if her initial speed is 3m/s . Whar is the free fall acceleration on the planet?

The bob of a simple pendulum takes 0.25seconds to swing from it equilibrium position to one extreme end. Calculate its period?

A sled is pulled from rest by a net force of 2.8 N [forward]. The sled moves 7.4 m, reaching a velocity of 3.9 m/s [forward]. Determine the mass of the sled. (determine the mass by using one of the kinematic equations).

A CD starts from rest and accelerates to an angular frequency of 3.5 rev/s. Calculate the disc s average period T and centripetal velocity at the edge of the disc when radius is 2.0*10^-2m.

Show that simple harmonic motion y(t) = C1 cos ωt + C2 sin ωt can be written as:

a. y(t) = A sin(ωt + ϕ0)

b. y(t) = A cos(ωt + ϕ1)