2. A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 m. What

is the speed of sound in steel?

A pair of electrically charged objects attract each other with a force of 20 n when they are a distance of 5 m apart. if their charges stay the same, then what will be the attractive force between them when they are 20 m apart?

A projectile is thrown at an angle 30° from horizontal. Which statement about its vertical component of velocity is true? A. The magnitude of the vertical velocity decreases as the projectile moves upward. B.

What types of waves make up the electromagnetic spectrum?

A=vf-vi/t find Vf find t

A 4.02 * 10-5 kg raindrop falls vertically at constant speed under the influence of gravity and air resistance. After the drop has fallen 43 m, what is the work done by gravity? The acceleration of gravity is 9.8 m/s 2

Which statement about speed and/or velocity is true? Velocity has both speed and direction. Speed is constant. Speed has direction and velocity. Speed is measured over time.

Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0 * 1021 Hz. The speed of light is 3 * 108 m/s.

Is movements of ocean currents mainly caused by the moon

Which one of the following choices is an effective way to pervent low-back pain A. eliminate warm-up before exercise B. lift objects by putting weight on your upper back C. maintain correct posture Do. limit the amount of exercise you do per week

Two cups of the same size are filled to the brim with clear liquids. Cup A holds water. Cup B contains alcohol. Your teacher challenges you to figure out which cup holds water.