A person with a mass of 15kg is walking uphill at a velocity of2m/s. What is the walker's momentum?


Answer 1


30 kgm/s


The momentum of a body is given by the product of mass and  its velocity.

∴ momentum = mv

                        = 15 × 2

                        = 30 kgm/s

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B) The current passing through each bulb is the same.
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D) As more light bulbs are added in series, the brightness of the bulbs will stay the same.



The correct answer is option b) "The current passing through each bulb is the same."


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Because the current flowing through it only has one way to go, the same amount of current will be supplied at the same intensity throughout the circuit.

The equivalent or total resistance of the circuit is the sum of the resistances that compose it and will be greater than the greater of the resistances of the circuit. This means that as we add terminals (the devices connected to the power grid, which receive the current and transform it into another type of energy), the resistance increases.

Taking into account the definitions and characteristics above, the correct answer is option b) "The current passing through each bulb is the same."

It's B.

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A student pushes a 40-N block across the floor for a distance of 10 m. How much work was done to move the block? Question 3 options: 4 J 40 J 400 J 4,000 J



The work done to move the block is 400 Joules.


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Force acting on the block, F = 40 N

The distance covered by the block, d = 10 m

We need to find the work done by the block. The work done by an object is given by :

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W=40\ N* 10\ m

W = 400 Joules

So, the work done to move the block is 400 Joules. Hence, the correct option is (B) "400 J".

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