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

As light passes through transparent objects the speed at which it travels is

A concrete column has a diameter of 380 mm and a length of 2.6 m. if the density (mass/volume) of concrete is 2.45 mg/m3, determine the weight of the column in pounds.

Ben hit a 0.25kg nail into a wood with a 5.2kg hammer. If the hammer moves witht the speed of 52 m/s and two fifth of its kinetic energy is coverted to the internal energy of the hammber and nail. How much does the total internal. Energy increase

Eli stands on a skateboard at rest and throws a 0.5 kg rock at a velocity of 10.0m/s. Eli moves back at 0.05m/s. What is the combined mass of Eli and the skateboard

How many newtons of force would 200 grams apply? What would be the mass of an object that weights 7 N on earth? If an object weights 450 N. How much does it weight in pounds?

Is it possible to have motion in the absence of a net force?

There are 2 charged particles, A and B. You know that particle A is positively charged. When you place particle B next to particle A, then particle B starts moving away from particle A. What does this mean for particle B?

The speed of light is now to be defined 2.99792458x10^8 m/s express the speed of light to three significant figures five significant figures seven significant figures

An element that is a very reactive gas is most likely a member of what group?

Describe the concept of orbital motion as it relates to the earth., moon and sun