Section 1 - Question 2

Which explains why electromagnetic waves from the sun can be harmful, but electromagnetic waves from microwaves are not?
A
Electromagnetic waves from the sun have a shorter wavelength, but more energy.

B
Electromagnetic waves from the sun have a longer wavelength, but more energy.

C
Electromagnetic waves from the sun have the same wavelength, but more energy.

D
Electromagnetic waves from the sun have the same wavelength, but less energy.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.