4. A force of 6.0 Newtons is applied to a block at rest on a horizontal frictionless surface over a 7.0 meter span. How much energy is gained by the block?

42 Joules

Explanation:

Given that a force of 6.0 Newtons is applied to a block at rest on a horizontal frictionless surface over a 7.0 meter span. How much energy is gained by the block?

The parameters given are:

Distance covered = 7.0 m

The force = 6.0 m

The formula for work done is the product of force and distance. That is,

Work done = force × distance

Where work done is the same as energy.

Energy = force × distance

Energy = 6 × 7

Energy = 42 Joules.

Therefore, the energy gained by the block is 42 Joules.

i think the answer is b

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27