A box of mass m is pushed by force Fp at an angle θ along a frictionless surface. The box accelerates to the left. What is the magnitude of the normal force?

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.

Matter that emits no light at any wavelength is called