Which of the following is an example of something that undergoes acceleration while moving at a constant speed?

1.a man standing in an elevator

2. a car making a circle in a parking lot

3. none of these. an object that undergoes
an acceleration has to change its speed

4. a football flying in the air

5. a car moving straight backwards on the
road

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?