Can someone list some era's?

A 150 kg safe on frictionless casters is being raised at 1.20m to the bed of a truck using planks 4m long. The force needed to push the safe up is

17. Which statement accurately describes the interaction between the poles of two bar magnets? A A north pole repels a south pole. B A north pole attracts a north pole OC A north pole attracts a south pole.

Gravitational force decreases with distance. what does this mean for a space traveler who leaves earth in a spaceship?

Which Greek first proposed that the sun was the center of the universe?

The ability of a material to transfer heat of electrical current is called?

To stretch a certain nonlinear spring by an amount x requires a force F given by F = 40 x - 6 x 2, where F is in Newtons and x is in meters.

A wave passes through an opening in a barrier. The amount of diffraction experienced by the wave depends on the size of the opening and the wave's (1) amplitude (3) velocity (2) wavelength (4) phase

Balanced - Forces acting on an object are balanced if the ... If forced on an object are balanced then the object cannot be ...

How are magnetic stripes near mid-ocean ridges evidence for sea-floor spreading?

If a truck has a mass of 2 x 106 grams and a velocity of 35m/s, what is its momentum? kgm/s a. 2 million b. 70 c. 57.14 d. 70,000 e. 57,100