I will mark you brainlist please help

Physics

1 answer:

denis-greek [22]3 years ago

8 0

Answer:15th

Explanation:

I believe it will fall on the 15th stair because 10 times 15 is 150 divided by 10 m/s equals 15

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Using energy considerations, calculate the average force (in N) a 70.0 kg sprinter exerts backward on the track to accelerate fr

atroni [7]

Answer:

137.8 N

Explanation:

First we need to find the acceleration of the sprinter. To do so, we can use the Torricelli's equation:

V^2 = Vo^2 + 2*a*S

9^2 = 2^2 + 2*a*25

81 = 4 + 50a

50a = 77

a = 77/50 = 1.54 m/s2

Now, to find the resulting force in the sprinter, we can use the following equation:

Force = mass * acceleration

Force = 70 * 1.54 = 107.8 N

If we have a 30 N force against the sprinter, the total force applied is:

Resulting force = Applied force - Wind force

107.8 = Applied force - 30

Applied force = 137.8 N

5 0

4 years ago

To find the number of neutrons in an atom you would subtract?

Ghella [55]

You need to subtract the atomic number from the atomic mass to find the # of neutrons.

8 0

3 years ago

An object with a density of 0.85 g/cc is dropped into each of the two beakers shown below. Beaker 1 has a density of 0.5 g/cc. B

Oliga [24]

Answer:

The object will sink in the liquid in beaker 1.

The object will float in the liquid in beaker 2

Explanation:

The density of an object relative to the density of a fluid determines if the object floats or sink in a fluid. The density of a material is the measure of the amount of mass of that material packed into a unit volume of that material.

For the beaker 1, the liquid in this beaker has a density of 0.5 g/cc, which is lesser than the density of the object (0.85 g/cc). This means that the object will add more mass than there should be to the volume of the space it displaces within the field. This results in the object sinking in the fluid.

For beaker 2, the liquid in this beaker has a density of 1 g/cc, which is more than the density of the object (0.85 g/cc). This means that the object will add less mass than there should be to the volume of the space it displaces within the field. This results in the object floating in the fluid.