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UkoKoshka [18]
3 years ago
7

What is the speed of a vehicle that moves 40 meters in 2 seconds

Physics
1 answer:
Marianna [84]3 years ago
5 0

Speed = distance / time

           = 40/2

Speed = 20 m/s

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When we come out in the sun, we feel warm. How does the heat from the sun reach us?
dsp73

Answer:

<h2>Radiation</h2>

Explanation:

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The Sun reaches us by propagating through the vacuum of space. Sunlight reaches the Earth in about 8 minutes and 20 seconds. When this energy reaches the Earth's atmosphere, both conduction and convection play key roles to scatter it throughout the planet.

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Calculate the strength and direction of the electric field 300 mm to the right of a -200 C electric
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Choose the sequence of energy forms that best fits each item.
levacccp [35]

Answer:

1. chemical energy --> electrical energy --> light energy

2. Electrical Energy --> Mechanical Energy

3. Electrical Energy --> Heat Energy

4. Chemical Energy --> Thermal Energy  --> Mechanical Energy

5. Nuclear Energy --> Light energy and thermal energy

6. Mechanical Energy --> Electric Energy

7. Chemical Energy --> Electrical Energy --> Sound Energy

8. Mechanical Energy --> Sound Energy

Explanation:

1.<u>FLASHLIGHT</u>:

chemical energy --> electrical energy --> light energy

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2.<u>ELECTRIC SAW</u>:

Electrical Energy --> Mechanical Energy

The electrical energy from the socket is converted to the mechanical energy used to run the saw blade.

3.<u>TOASTER</u>:

Electrical Energy --> Heat Energy

The electrical energy from the socket is converted to the heat energy (thermal energy) used in browning the bread.

4.<u>GAS POWERED SCOOTER</u>:

Chemical Energy --> Thermal Energy  --> Mechanical Energy

The chemical energy from fuel, such as petrol is converted to heat (thermal energy) in the engine by the process of combustion. This heat is then used to do work by conversion into mechanical energy, through piston movement, which in turn moves the shaft and the scooter.

5.<u>THE SUN</u>:

Nuclear Energy --> Light energy and thermal energy

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6.<u>WIND TURBINE</u>:

Mechanical Energy --> Electric Energy

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7.<u>IPOD</u>:

Chemical Energy --> Electrical Energy --> Sound Energy

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8.<u>SPEAKER VIBRATES</u>

Mechanical Energy --> Sound Energy

The mechanical energy due to vibration produces sound energy.

6 0
3 years ago
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What is the change in temperature of a substance that goes from -45 degrees C to 15 degrees C? *
Nutka1998 [239]

Answer:.

Explanation:

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22. (I) A car slows down from 28 m/s to rest in a distance of
lidiya [134]

Answer:

a = -8.912 m/s²

Explanation:

Given,

The initial velocity of the car, u = 28 m/s

The final velocity of the car, v = 0

The distance traveled by car, d = 88 m

The velocity displacement relation is given by the formula

                                          v = d/t

∴                                         t = d/v

Substituting in the above values in the given equation

                                           t = 88/28

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The acceleration is given by the formula

                                         a = (v-u)/t

                                            = (0 - 28)/3.142

                                            = -8.912 m/s²

The negative sign is that the car is decelerating.

Hence, acceleration a = -8.912 m/s²

7 0
3 years ago
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