ANSWER:
d) all of these
STEP-BY-STEP EXPLANATION:
If no net force acts on an object, it remains at rest if it is initially at rest, or maintains its speed if it is initially in motion. Objects can move at a constant speed while experiencing zero net force; if the speed is constant, the acceleration is zero.
So the correct answer is at rest, zero acceleration, and constant speed, that is option d) all of these
The correct answer is
<span>B) UV waves are higher frequency and carry more energy.
In fact, UV waves have higher frequency than visible light. For comparison, visible light has frequency in the range 430-770 THz (</span>

)<span>, while ultraviolets (UV) have frequency higher than these values (at the order of 1 PHz, </span>

).
The energy of electromagnetic radiation is proportional to its frequency, according to the equation

where h is the Planck constant and f is the frequency. We see that the higher the frequency, the greater the energy, so UV waves carry more energy than visible light.
D. A magnetic field created by the electric current causes the compass needle to move.
Answer:
Gravity varies when the Earth rotates and its mass and density differ based on where you are on the planet. Knowing how gravity affects sea level thus aids geodesists in making more precise calculations. The mean sea level would be higher in parts of the earth where gravitational forces are heavier.
Explanation: