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3 years ago

Stella is driving down a steep hill. she should keep her car __ to help _.

Physics

1 answer:

Softa [21]3 years ago

8 0

Answer:

Stella is driving down a steep hill. She should keep her car in a lower gear to help slow her vehicle.

Explanation:

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A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled is pushed a distance of 4.5m starting fr

sergejj [24]

Answer:

The net force acting on the bobsled is 300 N.

Explanation:

Given:

Mass of the bobsled is, $m=75\ kg$

Displacement is, $d=4.5\ m$

Initial speed is, $u=0$ m/s

Final speed is, $v=6.0$ m/s

Net acceleration acting on the bobsled can be determined using the following Newton's equation of motion:

$v^2=u^2+2ad$

Plug in all the given values and solve for acceleration, $a$ .

$(6.0)^2=0+2a(4.5)\\36=9a\\a=\frac{36}{9}=4\ m/s^2$

Now, as per Newton's second law, net force is the product of mass and acceleration. So,

$F_{net}=ma\\F_{net}=75\times 4=300\ N$

Therefore, the net force acting on the bobsled is 300 N.

7 0

3 years ago

In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the

Lerok [7]

Answer:

Minimum speed will be equal to 2.213 m/sec

Explanation:

We have given radius of the r = 2 m

Coefficient of friction $\mu =0.25$

At minimum speed frictional force will be equal to centripetal force

So $\mu mg=\frac{mv^2}{r}$

$\frac{v^2}{r}=\mu g$

$v=\sqrt{\mu rg}=\sqrt{0.25\times 2\times 9.8}=2.213m/sec$

So the minimum speed will be equal to 2.213 m/sec

8 0

3 years ago

Which of the following statements is true for ideal gases, but is not always true for real gases?

xxMikexx [17]

Answer:

C. Replacing one gas by another under the same conditions, has no effect on pressure.

Explanation:

Ideal gas:

A gas is treated as an ideal gas if temperature is high and pressure is low.

Kinetic energy for ideal gas given as

$K.E.=\dfrac{3}{2}KT$

So when temperature of gas is increases then Average molecular kinetic energy will also increases.

The size of molecule is negligible as compare to the dimension of container. It mean that volume occupied by molecule is less as compare to the volume of container.

The between molecules is perfectly elastic.

Ideal gas equation

P V = m R T

So the option C is not always true.

4 0

3 years ago

several months after a forest is cut down, a nearby river becomes much muddier than ever before. Infer how the river changed

ryzh [129]

Well this is just my opinion but I think because all the plants were gone they cant stop mud from rolling into it. Also when it rains the trees wont suck up the water, that will make it over flow and release into the land or dirt on the outsides of it. Mixing those two gives mud and it can potentially flow back in the river in largeish masses causing the river to mix with the mud makinging it more muddy. Hope this helps :D

4 0

4 years ago

5. Work is being done when a force

Artyom0805 [142]

Answer:

work is done when a force is applied. the force must not be zero and should make the object move through a certain distance.

4 0

2 years ago

Read 2 more answers

Stella is driving down a steep hill. she should keep her car __________ to help _________.

Stella is driving down a steep hill. she should keep her car __ to help _.