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3 years ago

Please send me the solution of the question.

Physics

2 answers:

Lady bird [3.3K]3 years ago

6 0

Answer:

The answer is 8829 joules

Explanation:

The equation for finding potential energy is

P.E = m*g*h

M (mass in kg)

g (gravity= 9.81)

h (height above the ground)

P.E = 30*9.81* 30 = 8829 joules

tekilochka [14]3 years ago

4 0

Answer:

potential energy =mgh

potential energy = 3×10×30

potential energy=900J

I would appreciate if my answer is chosen as a brainliest answer

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A square has sides of length 45mm.<br> What is the area of the square in mm²?

tamaranim1 [39]

Answer: 2025mm²

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6 0

3 years ago

A polarized beam of intensity Io is directed into a device consisting of two polarizers. The beam is vertically polarized, and t

timama [110]

Answer:

Explanation:

The intensity of polarised light after polarization through angle θ

I = I₀ cos²θ

Here θ = 23 for first polariser

Intensity after first polarisation

= I₀ cos²23 = .846 I₀

For second polariser θ = 90 - 23 = 67 degree

Intensity after second polarisation

= .846 I₀ cos²67 = .13 I₀ .

3 0

3 years ago

A Carnot engine has an efficiency of 0.537, and the temperature of its cold reservoir is 379 K.

katen-ka-za [31]

Answer:

(A) Th = 818.6 K

(B) Qh = 14211.7 J

Explanation:

efficiency (n) = 0.537

temperature of cold reservoir (Tc) = 379 K

heat rejected (Qc) = 6580 J

(A) find the temperature of the hot reservoir (Th)

n = 1 - $\frac{Tc}{Th}$

0.537 = 1 - $\frac{379}{Th}$

$\frac{379}{Th}$ = 1 - 0.537 = 0.463

Th = $\frac{379}{0.463}$

Th = 818.6 K

(B) what amount of heat is put into the engine (Qh) ?

from $\frac{Tc}{Th} = \frac{Qc}{Qh}$

Qh = 6580 ÷ $\frac{379}{818.6}$

Qh = 14211.7 J

8 0

3 years ago

Use your data to predict what a 400g bag would weigh.

Kobotan [32]

3.92N

Explanation:

Given mass:

Mass of bag = 400g

The mass of a substance is the amount of matter it contains.

Weight of a substance is the vertical force acting on a body in the presence of gravity.

Weight = mass x gravity

Since the mass of the bag is 400g;

Now we convert to kg

1000g = 1kg

400g = $\frac{400}{1000}$ = 0.4kg

Weight of bag = 0.4kg x 9.8m/s²

Weight of bag = 3.92N

learn more:

Weight and mass brainly.com/question/5956881

#learnwithBrainly

6 0

3 years ago

A football player, with a mass of 69.0 kg, slides on the ground after being knocked down. At the start of the slide, the player

White raven [17]

Answer:

(a) -472.305 J

(b) 1 m

Explanation:

(a)

Change in mechanical energy equals change in kinetic energy

Kinetic energy is given by $0.5mv^{2}$

Initial kinetic energy is $0.5\times 69\times 3.7^{2}=472.305 J$

Since he finally comes to rest, final kinetic energy is zero because the final velocity is zero

Change in kinetic energy is given by final kinetic energy- initial kinetic energy hence

0-472.305 J=-472.305 J

(b)

From fundamental kinematic equation

$v^{2}=u^{2}+2as$

Where v and u are final and initial velocities respectively, a is acceleration, s is distance

Making s the subject we obtain

$s=\frac {v^{2}-u^{2}}{-2a}$ but a=\mu g hence

$s=\frac {v^{2}-u^{2}}{-2\mu g}=\frac {0^{2}-3.7^{2}}{-2*0.7*9.81}=0.996796272\approx 1 m$

7 0

3 years ago

Please send me the solution of the question.​

Please send me the solution of the question.