When opposite poles of two magnets are brought together, the poles
a. attract each other.
b. repel each other.
c. cancel each other.
d. cause a net force of zero

The correct answer is A.

Explanation:

In magnets, there are two poles: South and north poles. Like poles repel each other. Unlike poles attract each other.

When two magnets of the opposite poles are brought together then the poles are attract each other.

When two magnets of the same  poles are brought together then the poles are repel each other.

Therefore, the correct answer is A.

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

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.