Why is electric field a vector?

A girl on a backyard trampoline bounces straight upward with an initial velocity of 4.5 m/s. what is the girl's velocity when she returns to the trampoline

If the pressure inside a rubber balloon is 1500 mmhg, what is this pressure in pounds-force per square inch (psi)

A 50 kg student climbs 3m to the top of a set of stairs. Calculate the change in the student's gravitational potential energy from the bottom to the top of the stairs.

How many significant figures does each value contain? We were able to sell 81,000 bottles of water in an hour. Pi is abbreviated as 3.14. The average mass of a US quarter is 5.670 grams. 502 students in the high school were absent last Tuesday.

A proton has___ charge.

A perpetual motion machine can never be built because it is not possible to eliminate A) Momentum B) Inertia C) Elasticity D) Friction

What makes the lumbar vertebrae different from the cervical vertebrae and the thoracic vertebrae?

Matter has Certain types of what

Identify the type of relationship that exists between density and temperature

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street