Physics Answers

for small uncertainty in the measurement of position of a particle, the wavelength of the incident light should be :

Small

Large

Average

Doesn't depend on wavelength

The magnetic flux through a coil of wire containing two loops changes at a constant rate from -58 Wb to 38 Wb in 0.34 s. What is the emf induced in the coil?

What would be the diameter of the earth if it had the density of neutron star ?

Two crates, one with mass 4.00 kg and the other with mass 6.00 kg, sit on the frictionless surface of a frozen pond, connected by a light rope. A woman wearing golf shoes (so she can traction on the ice) pulls horizontally on the 6.00 kg crate with a force F that gives the crate an acceleration of 2.50 m/s^2. a) What is the magnitude of the force F? b) What is the tension in the rope connecting the two crates?

In an experiment to measure the effectiveness of a type of gas angles a fraction was found to be 31° in the angle of incidence is 55° calculator refractive index of the class

Does the nucleus have structure just like atom?

1. A refrigerator and a rice cooker are connected in parallel to a 220 V line. The current in the refrigerator is 10 A and in the rice cooker is 4 A. Find the following;

(a) the resistance of each device

(b) the total resistance

(c) the current flowing in the line

a proton moving horizontally at 3.5x10^4 m/s enters a uniform magnetic field of 0.075 t directed upward at 30°with the horizontal. find the magnitude of the magnetic force acting on the proton

7. Using the formula at the beginning of this lesson, calculate the wavelength of a signal from KPhET 98.7. Remember that FM stations transmit in the Megahertz range. This means that KPhET is transmitting a frequency of 9.87 x107 hz. What is the wavelength of the signal from this radio station?

8. My favorite radio station is NPR, which transmits a signal that is has a wavelength of 3.38 m. What is the frequency of this signal? Remember, light speed is 3 x108 m/s.

9. AM 630 is where I listen to sports. The frequency is 630 khz (or 630,000 hz). What is the wavelength?

10. Pick your favorite radio station, or one your friends listen to. What is its frequency and wavelength?

Abbey and Mia are in the basement playing pool. On Abbey's recent shot, the cue ball was moving east at 82 cm/s when it struck the slower 5-ball moving in the same direction at 24 cm/s. The 5-ball immediately speeds up to 52 cm/s. Determine the post-collision speed of the cue ball in cm/s.