6.
if an astronaut were to exert a force on a ball, the ball would

a. fall downward

b. exert a force on the astronaut

c. make the astronaut fall

d. stop

If an astronaut were to exert a force on a ball, the ball would exert a force on the astronaut.

Option B

Explanation:

If an astronaut applies force on the ball, same force will be applied on astronaut. It is universal as also according to Newton’s 3rd law. But, in space, there is no force of gravity. And so, the masses need not be considered.

If he pushes the ball with a force, and it gains some velocity v, the astronaut himself, will attain the same velocity. This is because, in space, no object attracts a mass. Astronaut fall is also correct if he applies a large amount of force while pushing.

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.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19