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kramer
3 years ago
14

Darius' boat sails into the harbor with a speed of 80m/s. After 20 seconds, Darius' boat has come to a stop at the dock. What is

his boat's acceleration?
Physics
1 answer:
Novosadov [1.4K]3 years ago
4 0

Answer:

The boat's acceleration is 4 m/s²

Explanation:

This question seeks to test the knowledge of acceleration and how to calculate acceleration when the speed is provided. Hence, the formula for acceleration would be used here.

Acceleration (m/s²) = speed (in m/s) ÷ time (in seconds)

Acceleration = 80 m/s ÷ 20 secs

Acceleration = 4 m/s² or 4 ms⁻²

The boat's acceleration is 4 m/s²

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Stellar-sized black holes form when a star explodes in a supernova. True or False
svetoff [14.1K]

Answer:

True

Explanation:

Stellar-sized black holes form when a star explodes in a supernova is a true statement. Supernova occurs when a huge size star collapses into itself. This explosion is massive such that parts of the stars are thrown apart. And this phenomenon gives rise to super massive black holes. Supernova occurs when the core becomes very heavy and star is not able to hold its won weight.

4 0
3 years ago
A lamp has a power of 120 w and is left on for 24 hours. A television has a power of 350 W and is left on for 3 hours. Which sta
soldi70 [24.7K]
<h2>Hello!</h2>

The answer is C. The television uses 6,588,000 J less than the lamp.

<h2>Why?</h2>

First, we must know that 1 Wh( Watt consumed in 1 hour) = 3600 J

Wh is the unit that express the energy amount of consumed in 60 minutes/ 1 hour.

So,

From the enunciate information we can calculate the energy consumed by the lamp and the television.

For the lamp, we have that it left on for 24 hours and it has a power of 120

For the television, we have that it left on for 3 hours and it has a power of 350W

Calculating the energy consumed (Wh) we have:

Wh= Watt*Time= 120 Watt* 24 hours= 2880 Wh

and converting it to Joule, we have:

2880 Wh*\frac{3600 J}{1 Wh}= 10,368,000 J

Doing the same for the television, we have:

Wh= 350 Watt* 3 hours= 1050 Wh

and converting it to Joule, we have:

1050 Wh*\frac{3600 J}{1 Wh}= 3,780,000 J

Finally, we have

10,368,000J(Lamp)-3,780,000J(Television)= 6,588,000J:

Then having calculated both consume, we have that the television uses 6,588,000 J less than the lamp.

3 0
3 years ago
Read 2 more answers
Sort the processes based on the type of energy transfer they involve. condensation freezing deposition sublimation evaporation m
Eduardwww [97]

Answer:

condensation - thermal energy removed

freezing -thermal energy removed

deposition - thermal energy removed

sublimation - thermal energy added

evaporation - thermal energy added

melting - thermal energy added

Explanation:

Thermal energy is heat energy. Processes in which heat is added involve the addition of thermal energy while processes in which heat energy is removed involves removal of thermal energy.

Condensation involves a change from gas to liquid, freezing involves a change from liquid to solid while deposition involves the settling of mobile particles at a place. All these processes involve a decrease in energy of particles.

On the other hand, sublimation is a direct change from solid to gas, melting involves a change from solid to liquid while evaporation involves a change from liquid to gas. All these processes occur when energy is added to the particles in a system.

6 0
3 years ago
NEVERMIND ANSWER FOR SOME POINTS
saw5 [17]

Answer:

Answer what?

Explanation:

5 0
3 years ago
A 1kg skateboard sits at the top of a ramp 20 fr off the ground . How much potential energy does it have ?
Finger [1]

Answer:

196J

Explanation:

Given parameters:

Mass of skateboard  = 1kg

Height off the ground  = 20m

Unknown:

Potential energy  = ?

Solution:

The potential energy is the energy due to the position of a body above the ground.

It is mathematically expressed as:

      Potential energy  = mass x acceleration due gravity x height

     Potential energy  = 1 x 9.8 x 20  = 196J

8 0
3 years ago
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