Questions 3-4 A 1kg ball is released from rest from an initial height of 1m, rolls down and is brought to rest from a spring as it
compresses a distance x as shown in the figure. Assume NO
energy losses to the surrounding environment:
lego
3. The kinetic energy of the cart at point B is nearly
(A) 5 (B) 10) (C) 20 J (D) 40 )
(E) 80J

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

volts times amps 6 x 0.5 3w

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

3. dark matter

empty space could also be a simple vacuum