Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams. How old is the sample of calcium-51? 4.5 days 9.0 days 13.5 days 18 days

The tires on a new compact car have a diameter of 2.0 ft and are warranted for 60 000 miles. (a) Determine the angle (in radians) through which one of these tires will rotate during the warranty period.

The force a skateboard exerts on you if your mass is 60kg and you push on the skateboard with a force of 60N

Electrical energy can produce many other types of energy. When electricity runs through a stereo, what other type of energy is produced? mechanical energy light energy kinetic energy sound energy

Match each law or principle to its description. 1. law of original horizontality 3 The youngest strata is at the top and the oldest is at the bottom. 2. law of superposition 1 Sediment gets pulled down by gravity in a horizontal and flat layer. 3.

What are fossil fuels and are there alternatives to using fossil fuels to get the power we need?

From whom should a departing VFR aircraft request radar traffic information during ground operations?

A stone is thrown at an angle of 30.0 degrees above the horizontal from the top edge of a cliff with an initial speed of 15 m/s. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom at 6.30 s.

A particular solid is electrically charged after it is rubbed, but it is not known whether its charge is positive or negative. How could you determine which charge it has by using a piece of plastic and fur?

A mass of 5 kg is moving at 5 m/s when it collides with another mass of 2 kg moving in the same direction at 2 m/s. After the collision they become bonded together. What is the final velocity of the two masses together? 2.22 m/s 6.23 m/s 3.56 m/s 4.

The process of developing a sense of identity during adolescence was highlighted by