Which of the following is an expressipn of velocity?

O

A. 55 mi north

O B. 55 mph

O C. 90 km

O

D. 90 km/h north

Which exerts a gravitational force: a baseball, a football, or a bowling ball? a.) only the baseball because it is the most denseb.) only the bowling ball because it is has the most weightc.

What is the lowest mass that an object can have and still be a star?

In general, as the energy of a sound wave increases, A. the sound gets softer and then louder. B. the sound gets louder. C. the sound always remains the same. D. the sound gets softer.

When driving behind another vehicle at night, you should:?

What do you call the period between two full Moons

What is a radio interferometer? a device for correcting chromatic aberration in radio telescopes a device for absorbing and transmitting radio waves a network of several radio telescopes wired together a radio communication network joining several

In which galaxy is our solar system located? a. milky way b. ngc 4414 c. andromeda d. small magellanic cloud

Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m

A person suffering from anaemia gets tired

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?