21. True or false: During heat transfer heat always travels from the warmer object to the cooler object.

The speed of sound varies depending on many factors including temperature, pressure, and humidity, but it is typically found to be approximately 330 m/s. What is the frequency of a sound wave with a wavelength of 0.1 m?

At one instant, an electron (charge = - 1.6 x 10-19 C) is moving in the xy plane, the components of its velocity being vx = 5.0 x 105 m/s and vy = 3.0 x 105 m/s. A magnetic field of 0.80 T is in the positive y direction.

How to start my introduction in science about the history of matter?

At what stage of a reaction do atoms have the highest energy

A spinning spherical shell with radius 30 cm and negligent mass is filled with 0.5kg of sand. It started spinning at an angular velocity of 8 m/s. All the sand starts within the center 10-cm and by the end has moved to the outermost radius.

Which of the following is a false statement about dispersion forces? View Available Hint (s) Which of the following is a false statement about dispersion forces?

Which choice defines AC and DC correctly? In AC, electrons moving in one direction. In DC, they move in one direction and then in the other direction. In DC, electrons move in only one direction.

Why a c is advantageable than dc

Which is the larger change in temperature 1 Kelvin or 1 degree Celsius

When water is in a container the surface of the water is curved what the curve called?