A ball is thrown with an initial speed of 20m/s at an angle of 60 to the ground. If air resistance is negligible, what is the ball 's speed at the instant it reaches its maximum height from the ground.

The brakes on your automobile are capable of creating a deceleration of 4.7 m/s². If you are going 140 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 81 km/h speed limit?

The fact that electric charges return to the source of the current is an example of:

Two stones are launched from the top of a tall building. One stone is thrown in a direction 15.0 ∘ above the horizontal with a speed of 20.0 m/s; the other is thrown in a direction 15.0 ∘ below the horizontal with the same speed.

A "shooting star" is usually a grain of sand from outer space that burns up and gives off light as it enters the atmosphere. what exactly causes this burning?

A steel ball of mass 0.500 kg is fastened to a cord that is 70.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal. At the bottom of its path, the ball strikes a 3.

An automobile steering wheel is shown. The ideal mechanical advantage of this wheel and axle is. If a driver must exert a force of 2 N to overcome an axle resistance of 16 N, the AMA of the steering wheel is and its efficiency is__ %.?

How does the law of conservation of energy apply to machines? -Machines create energy from scratch. -Machines consume energy until no energy remains. -Energy transferred to a machine equals energy transferred from it.

As you turn up the volume on your mp3 player you are increasing

Which event would lead to an overpopulation of a species within a food web A. The grass was eaten by the rabbits stopped growing B. The population of wolves who ate the rabbits decreased C. The grasshopper were affected by the diseased grass D.

Which of the following is true A) land heats less rapidly than water B) land heats more rapidly than water C) land reaches higher temperatures than water D) both b and c