All categories

3 years ago

Kindly answer the question about Work and Power. Image is attached below.

Physics

1 answer:

natita [175]3 years ago

4 0

Answer:

89600 Watts.

Explanation:

From the question given above, the following data were obtained:

Mass (m) of speedboat = 2800 Kg

Initial velocity (u) = 0 m/s

Final velocity (v) = 16 m/s

Time (t) = 8 s

Power (P) expended by the speedboat =?

Next, we shall determine the acceleration of the speedboat. This can be obtained as follow:

Initial velocity (u) = 0 m/s

Final velocity (v) = 16 m/s

Time (t) = 8 s

Acceleration (a) =?

v = u + at

16 = 0 + (a × 8)

16 = 0 + 8a

16 = 8a

Divide both side by 8

a = 16/8

a = 2 m/s²

The acceleration of the speedboat is 2 m/s²

Next, we shall determine the force exerted by the speedboat. This can be obtained as follow:

Mass (m) of speedboat = 2800 Kg

Acceleration (a) of speedboat = 2 m/s²

Force (F) of speedboat =?

F = ma

F = 2800 × 2

F = 5600 N

Finally, we shall determine the expended by the speedboat at maximum speed. This can be obtained as follow:

Force (F) of speedboat = 5600 N

Maximum velocity (v) = 16 m/s

Power (P) expended by the speedboat =?

P = F × v

P = 5600 × 16

P = 89600 Watts

Thus, the power expended by the speedboat is 89600 Watts.

You might be interested in

A person runs up several flights of stairs and is exhausted at the top. Later the same person walks up the same stairs and does

KIM [24]

Answer:

Explanation:

Work done by the person depends on its mass and the height raised. It also depends on the acceleration due to gravity.

As the height raised and the mass of person is same. The value of acceleration due to gravity is also constant So, the work done is also same in both the cases.

6 0

3 years ago

A student puts a beaker of boiling water where it touches a block of ice. Which two statements are true? A. Thermal energy will

rodikova [14]

Answer: C and D

Explanation: I’m pretty sure it’s C and D I got the same question but cold water let me know please, thanks!

6 0

4 years ago

Read 2 more answers

"how long would it take for a ball dropped from the top of a 400-foot building to hit the ground? round your answer to two decim

Lelechka [254]

Hello

Let's convert first the height from foot to meters:
$S=400~ft=121.92~m$
This is the space covered by the ball in its accelerated motion, where the acceleration is the gravitational acceleration:
$a=g=9.81~m/s^2$
The law of motion is given by
$S= \frac{1}{2}at^2$
Re-arranging, we can get the total time of the motion:
$t= \sqrt{ \frac{2S}{a} }=4.99~s
$
which is the time the ball takes to hit the ground.

7 0

3 years ago

Read 2 more answers

How can the density of an object be determined?”

Nastasia [14]

Answer:

First you need to know the mass (grams) of the object and its volume, then what you do is Divide the mass by the volume in order to get an object's Density.

Explanation:

hope that helped good luck :)

6 0

4 years ago

Read 2 more answers

what nuclear fission and nuclear fusion have in common? A. They’re both used in power plants B. they have less mass than their r

arsen [322]

A. They’re both used in power plants . . . No.

Nuclear fission is used in all nuclear power plants. Fusion isn't used in any power plants yet, because we can't control it safely enough yet. The only thing we can use nuclear fusion for is still bombs.

B. they have less mass than their reactants . . . No.

Fission involves breaking atoms into pieces. Its products have less mass than its raw materials. Fusion involves sticking atoms together to make new ones. Its products have more mass than its raw materials. Whatever the incomplete statement ' B ' is trying to say, it's not true of both processes.

B. ==> If you try really hard, this statement (B) can be undertood as true. The TOTAL MASS after both a fission reaction and a fusion reaction is less than the total mass of whatever was fissled or fuzled. In both cases, the missing mass is accounted for by the energy that was radiated from the site of the nuclear reaction.

But the statement in ' B ' is very poorly written. When you read it, you don't know what 'they' refers to.

C. they start with the same reactants . . . No.

Man-made fission starts with the heaviest atoms ... Uranium and Plutonium. Man-made fusion starts with the lightest atoms ... Hydrogen.

D. their products have more mass than their reactants ... No.

Fission breaks heavy atoms and makes lighter ones. Fusion glues light atoms and makes heavier ones.

Gee whiz ! None of the choices is correct.

7 0

3 years ago

Read 2 more answers