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Elis [28]
2 years ago
10

PLEASE ANSWER ASAP!

Physics
1 answer:
dalvyx [7]2 years ago
6 0

Answer:

Explanation:

Since work = magnitude of the force times the displacement, then

W = 43.0(5.00) so

W = 215 N*m

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If the mass of the object is doubled and the speed is halved then kinetic energy will change by a factor of:
madam [21]

Answer:

kinetic energy will change by a factor of 1/2

Option C) 1/2 is the correct answer

Explanation:

Given the data in the question;

we know that;

Kinetic energy = 1/2.mv²

given that mass of the object is doubled; m1 = 2m

speed is halved; v1 = V/2

Now, New kinetic energy will be; 1/2.m1v1²

we substitute

Kinetic Energy = 1/2 × 2m × (v/2)²

Kinetic Energy = 1/2 × 2m × (v²/4)

Kinetic Energy = 1/2 × m × (v²/2)

Kinetic Energy = 1/2 [ 1/2mv² ]

Kinetic Energy = 1/2 [ KE ]

Therefore; kinetic energy will change by a factor of 1/2

Option C) 1/2 is the correct answer

3 0
1 year ago
2. A student slides a 0.75 kg textbook across a table, and it comes to rest after
lana [24]

The book's initial speed = 2.83 m/s

The mass of the textbook, m = 0.75 kg

The final speed of the textbook, v = 0 m/s (Since it comes to rest)

The distance covered by the book, d = 1.2 m

Coefficient of kinetic friction, \mu = 0.34

The frictional force between the table and the book is calculated as:

f_k=-\mu mg\\\\ f_k=-0.34 \times 0.75 \times 9.8\\\\f_k=-2.499N

The workdone by the textbook is calculated as:

W = Fd\\\\W=2.499(1.2)\\\\W=2.9988J

According to the work-kinetic energy theorem:

Workdone by the book = Change in Kinetic energy

W = 0.5m(v^2-u^2)\\\\-2.9988=0.5 \times 0.75 \times (0^2-u^2)\\\\-2.99988=-0.375u^2\\\\u^2=\frac{-2.9988}{-0.375} \\\\u^2=7.9968\\\\u=\sqrt{7.9968}\\\\u=2.83m/s

The book's initial speed = 2.83 m/s

Learn more here: brainly.com/question/25459845

4 0
1 year ago
Which statement is a postulate of general relativity?
zysi [14]

Answer:

The speed of light is constant for all observers

Explanation:

As per general postulate of relativity

  • Lorentz covariance of special relativity becomes a local Lorentz covariance in the presence of matter.

So

light speed c is independent of States of matter

7 0
10 months ago
What are the formulas for Work, KE, GPE and Power?
Katyanochek1 [597]

Answer:

work=f×d

GPE =m×g×h

kinetic energy =  \frac{1}{2} mv {}^{2}  \\ power =  \frac{w}{t}

6 0
2 years ago
Light energy with very high amplitude would be perceived as ________.
s2008m [1.1K]

Answer:

High amplitude is equivalent to loud sounds.

Explanation:

6 0
2 years ago
Read 2 more answers
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