Physics Answers

You and your friends are playing in the swimming pool with a 60-cm-diameter beach ball. How much force would be needed to push the ball completely under water?

Estimate the time required for a 5 MeV alpha particle to slow down

and stop in silicon. Repeat for the same particle in hydrogen gas?

Two charges q1 = –6 μC and q2 = +10 μC are placed 12 cm apart. Another charge, q3 = −2 μC is placed in the middle as shown in Figure 6. Determine the magnitude and direction of the force acting on q3 by the charge q1 and q2

in a completely inelastic collision between two objects, where the objects stick together after the collision, is it possible for the final kinetic energy of the system to be zero? if so, give an example in which this would occur. If the final kinetic energy is zero, what must the initial momentum of the system be? is the initial kinetic energy of the system zero? explain

a window washer is standing on the sacffold supported by a vertical rope at each end. the sacffold weighs 200N and is 3m long. what is the tension in each rope and when 700Nworker stands 1m from one end

A compound pendulum of mass 0.8 kg and length 1.2 m swings about a pivot point located at one end of the pendulum.

(a) Find its frequency of oscillation.

(b) Find the center of oscillation of the pendulum.

A block-spring system has a kinetic energy of 6 J and the spring has an elastic potential energy of 10 J when the block is at +4 cm. The amplitude of oscillation is 6 cm and the mass of the block is 450 gm.

(a) Find the elastic potential energy of the block and kinetic energy of the system when the block is at the equilibrium position, x = 0.

(b) Determine the velocity when the block is at x = 0.

1.What is the max electric field strength in an electromagnetic wave that has a maximum magnetic field strength of 5 x 10^-4 T (about 10mtimes the Earth's)?

A mass is oscillating with amplitude 𝐴 at the end of the spring. How far is this mass from the equilibrium if the elastic potential energy equals 𝛾 times the kinetic energy?

Find the formula for the focal length of a thin lens if the R₂ radius of curvature

of the lens surface is k times more than R₁ radius of curvature and the refraction index of

the lens is n = 2. The medium surrounding the lens is air.