You ran 400 meters in 2 minutes what is your speed

Answers

Answer 1

Answer:

The speed of an object is the distance divided by the time of travel. The speed of the person running 400 meters in 2 minutes is 3.3 m/s.

What is speed?

Speed is a physical quantity used to measure the distance covered per unit time. Speed is a scalar quantity thus, having magnitude only. The rate of speed is called velocity. Velocity is a vector quantity.

Speed in physics is the ratio of the distance covered per unit time. Thus, speed can have the units m/s, Km/hr, ft/s miles/s etc. As the time of the travel increases, speed is said to be decreasing.

The distance covered = 400 meters.

time = 2 minutes = 2 × 60 s = 120 s

Speed = distance / time

= 400 m/ 120 s

= 3.3 m/s.

Therefore, the speed is 3.3 m/s.

To find more on speed, refer here:

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Answer 2

Answer:

Answer:

3.3m/s

Explanation:

speed =Distance /Time

x=400m

t=2mintues=2min*60sec/min=120seconds

S=400m/120s

S=3.33333...

therefore speed = 3.3m/s

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Ann (mass 50 kg) is standing at the left end of a 15-m-long, 500 kg cart that has frictionless wheels and rolls on a frictionless track. Initially both Ann and the cart are at rest. Suddenly, Ann starts running along the cart at a speed of 5.0m/srelative to the cart.How far will Ann have run relative to the ground when she reaches the right end of the cart?Express your answer with the appropriate units.

how can the temperature of a substance remain the same even if the substance is absorbing thermal engergy

Answers

Temperature remains constant despite the application of thermal energy because phase change does not occur within the substance. To put it simply, here’s an example: You are drinking an orange juice outside and you decided to grab some ice to cool your juice. The mixture then turns into half ice and half juice with a temperature of exactly 0 degrees. But as you hold your glass, the ice begins to melt but the contents of the glass don’t change temperature. This happens because the thermal energy going into the glass come from the gas outside of the air which is the reason why the ice is melting causing the mixture not to warm up but do the opposite.

What happens when a roller coaster car moves down from the top of a hill?

Answers

Answer:

Gravitational potential energy is converted into kinetic energy

Explanation:

At the top of the hill, the roller coaster car has gravitational potential energy, which is given by:

$U=mgh$

where m is the mass of the car, g is the gravitational acceleration, h is the height of the hill.

As the car descends the hill, it gains speed (v), so it also gains kinetic energy, given by:

$K=(1)/(2)mv^2$

where v is the speed of the car.

The mechanical energy of the car is the sum of its potential energy and kinetic energy:

$E=U+K$

In absence of friction, the law of conservation of energy states that the mechanical energy of the car is constant. Therefore, since as the car moves down the hill the potential energy decreases (because the height, h, decreases), it means that the kinetic energy must increase (and this is wy the speed increases). So we can say that gravitational potential energy is converted into kinetic energy.

When the roller coaster moves down from the top of the hill, all of its stored potential energy is converted into kinetic energy to move it and when it goes back up the hill it turns kinetic into potential.

Which of the following actions or events did not contribute to the Dust Bowl? Farmers in the Central U.S. had plowed grasslands to grow food crops to feed the increasing human population. They left the fields plowed and bare in the winter months when crops were not grown, and this left the soil exposed to wind. A long drought in the 1930s left the exposed soil especially dry due to the lack of precipitation. With the advent of pesticides, minerals in the ground were leached.

Answers

The following cause that is notconsidered in the formation of a Dust Bowl is the lack of farmers in Oklahoma.The answer is letter B. in fact, the number of farmers increases due to thehigh grain prices of Worl War I that encourages farmers to plow millions ofacres of natural grass to plant wheat.

Answer:

With the advent of pesticides, minerals in the ground were leached.

Explanation:

got it right on odyssey

Which of the following is a characteristic of elements A. They are always metals
B. They cannot be divided into simpler substances
C. They break down when reacting with acids
D. They can be altered with and electric current

Answers

Answer:

Explanation:

They are the BASE elements. Cannot make them any simpler.

A hollow lens is made of thin glass and in the shape of a double concave lens. It can be filled with air, water of refractive index 1.33 or CS2 of refractive index 1.6. It will act as a diverging lens if it is (A) filled with air and immersed in water. (B) filled with water and immersed in CS2. (C) filled with air and immersed in CS2. (D) filled with CS2 and immersed in water.

Answers

Answer: B)

A hollow double concave lens acts as a diverging lens. When it is filled with a medium of higher refractive index than the surrounding, its diverging power increases.

So if the lens is:

A) Filled with air (n=1) and immersed in water (n=1.33) - Incorrect, air has lower refractive index than water

B) Filled with water (n=1.33) and immersed in CS2 (n=1.6) - Correct, water has lower refractive index than CS2

C) Filled with air (n=1) and immersed in CS2 (n=1.6) - Incorrect, air has lower refractive index than CS2

D) Filled with CS2 (n=1.6) and immersed in water (n=1.33) - Incorrect, CS2 has higher refractive index than water

Therefore, the lens will act as a diverging lens when filled with water and immersed in CS2, which is option B.

The key is that the material inside the lens must have a lower refractive index than the surrounding medium to increase the diverging power of the concave lens.

Explanation:

Does static electricity mean that the charges never move? explain

Answers

No it would be completely wrong to assume that static electricity means that the charges never move. Any kind of electricity always involves the movement of electrons. In reality, static electricity is caused by friction or by rubbing electrons from the surfaces of other materials. So the electrons did not get there by current and thus it is called static electricity.

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