If the second harmonic of a certain string is 42 Hz, what is the fundamental frequency of the string?

21 Hz

42 Hz

84 Hz

126 Hz

What is the kinetic energy of a 150 kg object moving at a velocity of 15 m/s? 25312.5 j 16875 j 50625 j 33750 j

Assume that you are performing general maintenance on your bicycle using a black lubricant. When you lubricate the brake levers, what type of fingerprints are you most likely to leave on them?

In a "minute to win it" game, cards are placed between cups to stack them. The contestant then pulls the card out in hopes that they will end with a set of stacked cups. Why does this work? There is no friction between the card and the cup.

A car travels in a straight line for 4.1 h at a constant speed of 95 km/h. What is its acceleration? Answer in units of m/s 2.

What hazard is associated with ionizing radiation?

If you combine 430.0 ml of water at 25.00 °c and 140.0 ml of water at 95.00 °c, what is the final temperature of the mixture? use 1.00 g/ml as the density of water. s

While working out, a man performed 200 j of work in 3 seconds. What was his power?

A funnel-shaped low pressure closure

A rubber rod can be charged negatively when it is rubbed with wool. predict what happens when you rub a copper rod with wool

A copper rod is 0.450 m long. Heat is added to the rod until it expands by 0.00130 m. How much did the temperature change? (Unit=C)