Why is it very difficult for astronomers to find objects like planets and asteroids?

Which of the following best describes the size of an asteroid

Which best describes a relationship among the vectors? Vectors P and Py are components of vector Px. Vectors Px and Py are components of vector P.

What is the length of the shadow cast on the vertical screen by your 10.0 cm hand if it is held at an angle of θ=30.0∘ above horizontal?

What is the fastest speed with which anything can move

At a resting pulse rate of 79 beats per minute, the human heart typically pumps about 67 mL of blood per beat. Blood has a denstity of 1060 kg / m3. Circulating all of the blood in the body through the heart takes about 1 min for a person at rest.

The product PV, where P and V represent pressure and volume respectively, is a unit for which? A entropy B force C impulse D work

IF it possible for an object to move for 10 seconds at a high speed and end up with an average velocity of zero? true or false

The boy moving down the hill posses what energy?

In what ways does a river carry its load?

What is a unit of mass?