Out of the choices given, igniting the gas-air mixture supplies the heat for the hot reservoir in a car's engine. The correct answer is C.
If the object is moving in a straight line with constant speed,
that's a description of " acceleration = zero ".
Zero acceleration means zero net force on the object.
NO net force is 'required' to keep an object moving in a straight line
at constant speed. In fact, if there IS any net force on the object,
then either its speed or its direction MUST change ... there's no way
to avoid it.
None of this depends on the object's mass, or on the speed or direction
of its motion.
When the truck accelerates forward the ball will shift to the back of the bed of the truck because of inertia
The sun exerts the strongest g-force, holding us (earth)in it's orbit, followed by the moon which affects the tides on earth.
The sun exhibits multiple temperatures from the core to the corona, with a range of over 25 million degrees Fahrenheit.