1. Define the term 'centre of gravity of a body'.

Express 9.39 x10^9 seconds I'm terms of days

Which statement best describes beaches? A.) Beaches are always changing due to factors such as waves adding and eroding sand. B.) Beaches change little over time as waves follow the same patterns year after year. C.

A possible means of space flight is to place a perfectly reflectingaluminized sheet into orbit around the Earth and then use the lightfrom the Sun to push this "solar sail." Suppose a sail of area5.

Which of the following best explains velocity? a. the speed of an object in motion b. the speed and direction of an object in motion c. only the change of direction of an object in motion d. the direction of an object in motion

f the absolute pressure in a tank is 128 kPa, determine the pressure head in mm of mercury. The atmospheric pressure is 100 kPa. The density of the mercury is 13,550 kg/m3. Express your answer using three significant figures.

What is the difference between speed and velocity and give an example.

Water flows over a section of niagara falls at the rate of 1.2x10^6 and falls 50.0 m. how much power is generated by the falling water

What is the darkest side of the moon called?

Brian is a healthy young man. He has been training with his teammates for a 50-yard dash for months. However, even with practice, he cannot run fast enough to qualify. What is the most likely reason that Brian can't qualify?

1. Are BEVs or hydrogen fuel cell vehicles a more promising transportation technology for the future? 2. Should car companies be required to produce electric cars?