Physics Answers

A string is attached to a body of mass 2 kg which is at rest on the ground. If the string  is pulled vertically upward with a constant force of 42 N, find how far the body rises  during the first second.

A uniform rod 2 m long and weighing 65N is pivoted to the wall. A weight of 25 N is suspended at the other end of the rod. What is the magnitude of vertical and horizontal components of the force exerted on the pivot as well as the tension in the string?

At what angle will 510-nm light produce a second-order maximum when falling on a grating whose slits are 1.00 x 10-3 cm apart?

If a diffraction grating produces a third-order bright spot for red light (of wavelength 700 nm) at 65.0° from the central maximum, at what angle will the second-order bright spot be for violet light (of wavelength 400 nm)?

Monochromatic light of wavelength 592 nm from a distant source passes through a slit that is 0.0290 mm wide. In the resulting diffraction pattern, the intensity at the center of the central maximum (θ= 0°) is 4.00 x 10-5 W/m2. What is the intensity at a point on the screen that corresponds to θ = 1.20°?

 Calculate the frequency of a pendulum if it makes 16 complete cycles in a time of 24.4 seconds.

Monochromatic light from a distant source is incident on a slit 0.750 mm wide. On a screen 2.00 m away, the distance from the central maximum of the diffraction pattern to the first minimum is measured to be 1.35 mm. Calculate the wavelength of the light.

For a diffraction grating, what is the advantage of (a) many slits, (b) closely spaced slits?

For diffraction by a single slit, what is the effect of increasing (a) the slit width, (b) the wavelength?

A student holds a tuning fork oscillating at 257 Hz. He walks toward a wall at a constant speed of 1.41 m/s.

(a) What beat frequency does he observe between the tuning fork and its echo?

(b) How fast must he walk away from the wall to observe a beat frequency of 4.90 Hz?

33 m/s