What weighs more a mole of feathers or bricks?

A 331 N stoplight is hanging in equilibrium from cables as shown. The tension in the right cable is 550 N, and it makes an angle of 12 degrees with the horizontal.

telescopes on the earth suffer from the fact that the light coming from the stars has to pass through air or space

1-) Two blocks of mass 3. SO kg and 8.00 kg are connected by a massless string that passes over a frictionless pulley. The inclines are frictionless. Find; (a) the magnitude of the acceleration of each block and (b) the tension in the string.

A box of books weighing 290 N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 34.9° below the horizontal. If the coefficient of kinetic friction between box and floor is 0.

If three of the balls are pulled back on a Newton's cradle and then let go, what will happen next?

Heat that is transferred by the movement of currents within a fluid is called?

5. What is the percent composition of sulfur in H2SO4? A. 32.7% B. 65.2% C. 98.1% D. 2.1%

A 0.8kg object accelerate at a rate of4 m/s2. What is the net force acting on a object

Which of the following is the best definition of an isotope? A. elements of the same kind with different numbers of neutrons B. elements of the same kind that have lost electrons C. elements of the same kind that have different electrical charges

Two cars approach each other; both cars are moving westward, one at 85 km/h, the other at 54 km/h. what is the magnitude of the velocity of the first car relative to (in the frame of reference of) the second car? answer in units of km/h.