Which two forces act directly on objects that are unable to be viewed by the unaided eye?

electromagnetic and strong

gravitational and electromagnetic

strong and weak

weak and gravitational

When generators use mechanical energy, what type of energy is produced? kinetic energy electrical energy potential energy magnetic energy

A motorcycle uses 50 000 kilojoules per minute. If 15 percent of the 15 energy generated by its engine is lost in the first few seconds, how much energy, in kilojoules, remains to power the motorcycle?

Which of the following causes a current in an electrical circuit? A. resistance B. a current difference C. a voltage difference D. the shape of the electrical circuit

1. Impulse is the product of force and distance. True or false? 2. The force necessary to lift an object is g. True or false? 3. A joule is a newton times a second. True or false? 4. Work is done to lift an object in the classroom. True or false? 5.

A certain water wave has a wavelength of 25 m and a frequency of 4.0 Hz. What is its velocity?

If a force of 40 newtons moves a cart a distance of 9 meters, the work done is Nm. If the same force moves the same cart three times that distance, the work done is Nm. NextReset

What is the critical angle c for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?

What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases? A. The resistance has increased. B. The volts have decreased. C. The power has increased.

The velocity - time graph of a ball of mass 25g moving on road is as given below: (a) How much force does the road exert on the ball to bring it to rest? (b) What is the direction of the force exerted by the road?

A spring required a force of 5.0 n to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?