Physics Answers

The electromagnetic spectrum contains various types of radiation with different properties. The James Webb Space Telescope is not like an optical telescope at home and does not capture visible light; instead, it observes the sky in the infrared spectrum.

Explain what infrared radiation is and answer the following questions: How is infrared radiation different from visible light? Why does the JWST observe infrared light, and what are the scientific advantages for astronomers?

The electromagnetic spectrum contains various types of radiation with different properties. The James Webb Space Telescope is not like an optical telescope at home and does not capture visible light; instead, it observes the sky in the infrared spectrum.

Explain what infrared radiation is and answer the following questions: How is infrared radiation different from visible light? Why does the JWST observe infrared light, and what are the scientific advantages for astronomers?

A uniform electric field of 500 N/C is established between two oppositely charged metal plates. A particle with a charge of +0.003 C is moved from the bottom (negatively charged) plate to the top plate. (Imagine that the string is tied to the charged that is pulling it upward). The distance between the plate is 5cm.

A. What is the change in the potential energy of the charge?

B. What is the change in electric potential from the bottom to the top plate?

A motorist traveling with a constant speed of 20.0 m/s passes a school-crossing corner, where the speed limit is 15.0 m/s. Just as the motorist passes, a police officer on a motorcycle at the corner starts off in pursuit with constant acceleration of 5.0 m/s^2. What is the total distance traveled by the motorist

Find the curl of the function r= xi+yj over x+y

Two identically charged one-peso coins are 1.5 m apart on a table. What is the charge of the coins if each of them experiences a repulsive force of 2.0 N?

The piston of a hydraulic automobile lift is 30 cm in diameter. What pressure, in

pascals, is required to lift a car of mass 1500 kg. Also express this pressure in

atmosphere.

A diving bell is to be designed to withstand the pressure of water at a depth of

2000 ft.

a. If sea water weighs 64 lb per cubic foot, what is the pressure at the depth?

b. What is the total force on a circular glass window 6 inches in diameter?

A certain body weighs 12N in air and 10 N in when immersed in water. Find its

total volume and its density.

When the United States finally converts officially to metric units, the Celsius

temperature scale will replace the Fahrenheit scale for everyday use. As a

familiarization exercise, find the Celsius temperature corresponding to

a. Cool room (68°F)

b. A hot summer day (95°F) and

c. A cold winter day (5°F)