If an object of mass 6 kg has an acceleratoon of 9 m/s2, what is the unbalanced force acting on it?

In 1974, the Arecibo Radio telescope in Puerto Rico was used to transmit a signal to M13, a star cluster about 25,000 light-years away. How long will it take the message to reach M13, and how far has the message travelled so far (in light-years) ?

What is the speed of sound in dry air if the temperature is 46°C?

Which of the following best describes reverberations

A race car starts from rest on a circular track. The car increases its speed at a constant rate at as it goes 4.25 times around the track.

As excess carbon dioxide is stored in the atmosphere and the atmosphere warms, this heat is also transferred to what?

Jim (mass=100kg) rollerblades on a smooth horizontal floor at a constant speed of 2.0 m/s for a distance of 5m in 5 seconds. What is the power in this process? (assume g is 10 m/s^2)

B1. A stone is dropped from the cliff. If the height of the cliff is 200cm. (a) calculate (1) Potential energy after falling for 20 seconds

Which statement most describes how the amplitude and energy of a sound wave are affected as the wave travels through air and as the wave travels through a brick wall?

Why do you think that some asteroids tumble end over end through space while other asteroids rotate around their axis?

What are five features that erosion forms along a river?