What are meant by the statement relative density of gold are 19.3

How do noise canceling headphones work? A.) by stopping sound waves B.) by interfering with sound waves C.) by using antennas D.) by transmitting light waves

Two vectors have a sum A and their difference is B. If A=B then, the angle between the two vectors is a) 0 b) 45 c) 120 d) 90 (all the options are in degree)

A ray of monochromatic light having a wavelength of 4.00 x 10-7 meter in air passes from air through Lucite and then into air again. 1) Calculate the frequency of light in air. 2) Identify the color of the light.

A science museum has asked you to design a simple pendulum that will make 29.0 complete swings in 83.0 s. What length should you specify for this pendulum?

A painted tooth on a spinning gear has angular acceleration α = (20-t) rad/s2, where t is in s. Its initial angular velocity, at t = 0 s, is 320 rpm.

Compare and contrast the terms melting and freezing

A medical cyclotron used in the production of medical isotopes accelerates protons to 6.5 MeV. The magnetic field in the cyclotron is 1.9 T.

What is the speed of sound in a vacuum?

An object has 60 j of potential energy and 40 j of kinetic energy. then 10 j of the potential energy is converted into kinetic energy. how much work was done on the object?

At what height above earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?