An object is in motion when it's distance from another object is changing.

True or false

The distance covered by a car at a time, t is given by X=20t+6t^4, calculate (i) the instantaneous velocity when t=1 (i) the instantaneous acceleration when t=1

During refraction, what happens to a wave when it travels from one medium to another? The wave travels in the opposite direction. The wave changes speed. The wave moves in the same direction. The wavelength increases.

What is hard water and what is soft water

A girl with a mass of 40 kg is swinging from a rope with a length of 2.5 m. What is the frequency of her swinging?

Graphing Motion 2,400 2.200 2,000 Mary 1.800 1,600 400 Kaury Distance (m) 200 1.000 800 Julie 600 400 200 10 20 30 Time (min) What is Julie's average speed after thirty minutes A. O 0.33 m/s B. 0.67 m/s C. O 1.5 m/s D. О 216 m/s

A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3 m from the source?

What experimental term is it when a ruler is dropped to the floor?

Where is most of the energy from incoming waves focused? A. spit B. headland C. underwater D. barrier beach

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?