Why is it desirable that microscope objective be parfocal?

Why are satellites placed into orbit at least 150 km above Earth's surface? to avoid air resistance to match Earth's curvature to create inertia to increase friction

Why is random sampling and random assignment in experimental research important?

A horizontal force of 120 N is required to push a bookcase across the floor at a constant velocity how much is the friction force that acts on the sliding bookcase

What is the importance of protein to the health of a human being

Airplane releases a ball as it flies parallel to the ground at a height of 195m, the ball lands on the ground at exactly 195m from the release piont, calculate the speed v of the plane

Which list gives the proper sequence of energy changes that occur in a hydroelectric plant? The mechanical energy of the turbine rotates the generator parts The turbine blades capture the kinetic energy of the water Electrical energy is transferred

A locomotive is pulling 16 freight cars, each of which is loaded with the same amount of weight. The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at 0.

What is the special feature of the upper mantle?

What is the difference between weight and mass? mass and weight are both intrinsic properties of an object. if you multiply the mass of an object by the acceleration due to gravity, you will obtain the object's weight.

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. the skipper estimates the distance between crests is 15 m. what is the speed of the water waves?