The 8.00-cm long second hand on a watch rotates smoothly.

What is its angular velocity?

What is the speed of the tip of the hand?

Using what you have learned about energy transformations, explain why the driver of a car has to continuously apply pressure to the gas pedal in order to keep the car cruising at a steady speed, even on a flat road.

Convert from standard form to scientific notation: 0.00000013 A) 1.3 x 10-7 B) 13 x 108 C) 1.3 x 107 D) 13 x 10-8

What is the change in the atomic number when an atom emits an alpha particle?

Object A is negatively charged. Object A and Object B repel. Object B and Object C attract. Object C and Object D repel. What type of charge does Object B, Object C, and Object D possess?

In a classroom demonstration, two long parallel wires are separated by a distance of 2.25 cm. One wire carries a current of 1.30 A while the other carries a current of 3.15 A. The currents are in the same direction.

15 grams of liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

A Car is lifted a certain distance in a service station and therefore has potential energy relative to the floor. if it was lifted twice as high, how much potential energy would it have?

How long does it take a 750-w coffeepot to bring to a boil 0.75 l of water initially at 11°c? assume that the part of the pot which is heated with the water is made of 280 g of aluminum, and that no water boils away?

An electric motor rotating a workshop grinding wheel at a rate of 151 rev/min is switched off. Assume constant angular deceleration of magnitude 2.23 rad/s 2. Through how many revolutions does the wheel turn before it finally comes to rest

1. What is the atomic number of an atom? Why is this number important? |