Which of the following is precise given that the accepted value is 5.345 and the observed values are 3.253, 3.45, and 3.732?

3.253
3.457
3.732
all of the above
none of the above

[multiple choice] if given an accepted value of 5.95 m and three observed values of 5.73 m, 5.90 m, and 5.95 m, the observed value of 5.90 m

is accurate.
is precise.
has only two significant digits.
has at least one digit that is not significant.
has a percent error of −0.8%.
is equivalent to 5.90 109 nm.
has a derived si unit.

and explanation for these too.. and you! i'd really love to understand these.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.