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3 years ago

A car drives 10km with a speed of 72 km/hr and then runs out of gas. Then you walk 2km for the next 30 min

Physics

1 answer:

marin [14]3 years ago

5 0

Given :

A car drives 10 km with a speed of 72 km/hr and then runs out of gas.

Then you walk 2 km for the next 30 min until you find a gas station .

To Find :

The average speed of whole journey .

Solution :

Average speed is given by :

$v_{avg}=\dfrac{\text{Total distance covered}}{\text{Total time taken}}\\\\v_{avg}=\dfrac{10+2}{\dfrac{10}{72}+\dfrac{1}{2}}\\\\\\v_{avg}=18.78\ km/hr$

Hence , this is the required solution .

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The gravitational force between a satellite and Earth’s moon is 324 N. The mass of the moon is 7. 3 × 1022 kg. If the distance f

yKpoI14uk [10]

The gravitational force is s type of force that has the ability to attract any two objects with mass. The mass of the satellite will be 450 kg.

<h3>What is the gravitational force?</h3>

The gravitational force is s type of force that has the ability to attract any two objects with mass. Gravitational force tries to pull two masses towards each other.

The given data in the problem is;

F is the gravitational force = 324 N,

m₁ is the mass of the moon = 7.3 * 10²²kg

r is the distance between the moon and satellite = 2.6 * 10 ⁶m.

m₂ is the mass of satelite =?

G is the gravitational constant = 6.67×10⁻¹¹

The gravitational force is given by

$\rm F= \frac{Gm_1m_2}{r^2} \\\\ \rm m_2 = \frac{Fr^2}{Gm_1} \\\\ \rm m_2 = \frac{324 \times (2.6\times 10^6)^2}{6.67\times 10^{-11} \times 7.3 \times 10^22 } \\\\ \rm m_2= 450 kg$

Hence the mass of the satellite will be 450 kg.

To learn more about the gravitational force refer to the link;

brainly.com/question/24783651

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3 years ago

Does sound travel faster through stiffer objects yes or no and explain why?

kap26 [50]

Yes because The stiffer the medium the faster the sound waves will travel through it This is because in a stiff material, each molecule is more interconnected to the other molecules around it.

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3 years ago

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A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to

GarryVolchara [31]

Explanation:

It is given that,

Mass of the block, m = 3 kg

Initially, the block is at rest, u = 0

Force acting on the block, P = 12 N

The coefficient of kinetic friction between the block and the surface is, $\mu_k=0.2$

We need to find the rate is the force P doing work on the block at t = 2.0 s. The rate at which work is done is called the power. Let is equal to P'

Frictional force acting on the block, $f=\mu_k mg$

$f=0.2\times 3\ kg\times 9.8\ m/s^2=5.88\ N$

So, the net force acting on the block, F = P - f

$F=12-5.88=6.12\ N$

Let a is the acceleration of the block, $a=\dfrac{F}{m}$

$a=\dfrac{6.12}{3}=2.04\ m/s^2$

Let v is the velocity of the block after 2 seconds. So,

$v=u+at$

$v=0+2.04\times 2$

v = 4.08 m/s

Power, $P'=\dfrac{W}{t}=\dfrac{F.d}{t}=F.v$

$P'=12\ N\times 4.08\ m/s=48.96\ Watts$

So, the force P is doing work on the block at the rate of 48.96 watts.

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3 years ago

Collect information about working of Geyser and prepare a report

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A geyser is actually a devise that coverts electrical energy into heat energy for heating up water. The heating element that is inside the geyser actually gets heated up and then in turn it heats the water in contact with it within the geyser. There is also a thermostat device within the geyser that cuts off the heating when the water temperature reaches the desired level. This helps in stopping of electrical energy loss. One inlet brings in cold water while another outlet gets rid of the hot water. When the temperature of the water falls below the desired level the heating is again started by the thermostat.

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3 years ago

In science, Bob learns that the energy of a wave is directly proportional to the square of the waves amplitude. If the energy of

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Answer:

Probably none of the above. it's says directly proportional so there would be a proportionality constant.

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3 years ago