a cylindrical copper rod has resistance r its reformed to half its original length what is its new resistance

A capacitor stores an energy of 8 Joules when there is a voltage of 51 volts across its terminals. A second identical capacitor of the same value is stores an energy of 2 Joules. What is the voltage across the terminals of the second capacitor?

If you hold a 50 kilogram barbell above your head for 3 seconds and the acceleration due to gravity is 9.8 meters per second per second, how much work did you do? OA) OJ OB) 150 kg s OC) 490 N OD 1,470 NS

How long ago did the Big Bang happen?

The circumference of the Earth is approximately 40,000 km. The Earth has a magnetic field that protects it from solar particle radiation. The major element comprising the solid inner core of the Earth is iron. The Earth is approximately 4.

A package of aluminum foil contains 50. ft2 of foil, which weighs approximately 6.0 oz. Aluminum has a density of 2.70 g/cm3.

Newton's third law states that when an object exerts a force on another object, the second object exerts an equal but opposite force on the first object. Which of the following shows an example of this? a.

A car is moving 14.4 m/s when it hits the brakes. It slow from 78.8 m, which take 9.92s. It then accelerates at 1.83 m/s 2 for 4.50 s. What is the total displacement?

Select all of the answers that apply. What conditions on Earth are unique from other planets in our solar system?

Which is a chemical change

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is?