PHYSICS HIGH SCHOOL

How much force is needed to stop a 90-kg soccer player if he decelerates at 15 m/s^2?A. 15 N
B. 6 N
C. 135 N
D. 1,350 N

Answers

Answer 1
Answer: We have: F = m×a
Here, m = 90 Kg
a = 15 m/s²

Substitute their values into the expression:
F = 90 × 15
F = 1350 N

In short, Your Answer would be Option D

Hope this helps!

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Imagine that you are working as a roller coaster designer. You want to build a record breaking coaster that goes 70.0 m/s at the bottom of the first hill. You estimate that the efficiency of the tracks and cars you are using 90.0%. How high must the first hill be?

Answers


Wow !  This is not simple.  At first, it looks like there's not enough information, because we don't know the mass of the cars.  But I"m pretty sure it turns out that we don't need to know it.

At the top of the first hill, the car's potential energy is

                                  PE = (mass) x (gravity) x (height) .

At the bottom, the car's kinetic energy is

                                 KE = (1/2) (mass) (speed²) .

You said that the car's speed is 70 m/s at the bottom of the hill,
and you also said that 10% of the energy will be lost on the way
down.  So now, here comes the big jump.  Put a comment under
my answer if you don't see where I got this equation:

                                   KE = 0.9  PE

        (1/2) (mass) (70 m/s)² = (0.9) (mass) (gravity) (height)     

Divide each side by (mass): 

               (0.5) (4900 m²/s²) = (0.9) (9.8 m/s²) (height)

(There goes the mass.  As long as the whole thing is 90% efficient,
the solution will be the same for any number of cars, loaded with
any number of passengers.)

Divide each side by (0.9):

               (0.5/0.9) (4900 m²/s²) = (9.8 m/s²) (height)

Divide each side by (9.8 m/s²):

               Height = (5/9)(4900 m²/s²) / (9.8 m/s²)

                          =  (5 x 4900 m²/s²) / (9 x 9.8 m/s²)

                          =  (24,500 / 88.2)  (m²/s²) / (m/s²)

                          =        277-7/9    meters
                                  (about 911 feet)

Why current remains same in series combination of resistors in all resistors and p.d. remains different?

Answers

Current at all points of a series circuit must be the same, because there's no place in the circuit where electrons are being manufactured, and no place where they're leaking out and falling on the floor. The nimber of electrons that leaves the loop is the same number that entered it. I'm not sure what is nmeant by "p.d. remains different" .

A particle is being accelerated through space by a 10 N force. Suddenly the particle encounters a second of 10 N force in the opposite direction. The particle with both forces acting?

Answers

Answer:

The particle will be rendered still

Explanation:

The particle will be rendered still because of the Newton’s 1st law of motion states that a body will continue to move on forever until contacted by an equal and opposite force. The same case has been produced here and it is justifying the law. If the Force has another direction and magnitude than 10 N then the body will continue to move on in the direction of the greater force.

How important is your role as a human being in the natural world

Answers

Well, the natural world has existed for a long time without humans, so we know that we're not indispensable to the natural world.

We can influence it though, as is shown by the current man-made global warming: so it is important that we take good care of the part of the natural world that we live in so that we can live in it for a long time.

How many moles of Sulphur dioxide are there in 192 g of that gas ?

Answers

Answer:

3.00 moles

Explanation:

To calculate the number of moles of sulfur dioxide (SO2) in 192 grams of the gas, you can use the molar mass of SO2. Sulfur dioxide has a molar mass of approximately  64.0638 grams per mole.

Now, you can use the formula:

Number of moles = Mass (g) / Molar mass (g/mol)

Number of moles = 192 g /  64.0638 g/mol ≈ 2.997 moles

So, there are approximately 3.00 moles of sulfur dioxide in 192 grams of the gas.

If a force of 65 N is exerted on a 45 kg sofa and the sofa is moved 6.0 meters, how much work is done in moving the sofa? 17,550 J 171.990 J 390 J none of the above

Answers

Answer:

The answer to your question is:   W = 390 J

Explanation:

Work is the transfer of energy when a body is moved from one place to another.

Data

Force = 65 N

mass = 45 kg

distance = 6 meters

work = ? J

Formula

W = F x d

Process

                   W = 65 N x 6 m

                   W = 390 J

Answer: 390 J

Explanation:

i got it right on my exam :D
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