Select the correct answer from each drop-down menu.
All sound waves move at nearly the same speed through the air.
High-frequency sound waves have a shorter
and a higher
than low-frequency sound waves.
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What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?