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jeka57 [31]
3 years ago
6

Please Help!!! For A&B

Physics
1 answer:
klio [65]3 years ago
5 0

Answer:

A. 40N

B. 5m/s

Explanation:

A.

Impulse is equal to the area under the curve of a force vs. time graph. In this case, the area is in the shape of a triangle with base 8 (12-4=8) and perpendicular height 10:

<em>Area of a triangle = (1/2)bh</em>

A=(1/2)*8*10

=40

ANSWER: 40N

B.

<em>Impulse = mass * velocity</em>

40 = 8v

v = 5

ANSWER: 5m/s

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A window has a glass surface of 2907 cm2 and a thickness of 5.6 mm. Find the rate of energy transfer by conduction through this
butalik [34]

Answer:

2.30714 W

-16.38071 W

Explanation:

k = Heat conduction coefficient = 0.8 W/(m·°C)

A = Area = 2907 cm²

l = Thickness = 5.6 mm

T_2 = Outside temperature

T_1 = Inside temperature

Rate of heat transfer is given by

Q=\frac{kA(T_2-T_1)}{l}\\\Rightarrow Q=\frac{0.8\times 2907\times 10^{-6}\times (81-71)\times \frac{5}{9}}{5.6\times 10^{-3}}\\\Rightarrow Q=2.30714\ W

The rate of energy transfer is 2.30714 W

Q=\frac{kA(T_2-T_1)}{l}\\\Rightarrow Q=\frac{0.8\times 2907\times 10^{-6}\times (0-71)\times \frac{5}{9}}{5.6\times 10^{-3}}\\\Rightarrow Q=-16.38071\ W

The rate of energy transfer is -16.38071 W

7 0
3 years ago
Which stars are composed of matter in which electrons have combined with protons?
alexira [117]
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6 0
3 years ago
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The ratio of the number of pigs to the number of horse in a farm is 2 to 3 (2:3), if therected are 24 horses, what is the number
pickupchik [31]

Answer:

16 pigs

Explanation:

Let the horses be H.

Let the pigs be P

Let the total number of animals be x.

Given the following data;

Ratio of P to H = 2:3 = 2 + 3 = 5

Number of horses = 24

To find the number of pigs;

First of all, we would determine the total number of animals x.

From the ratio of horse, H:

3/5 * x = 24

Cross-multiplying, we have;

3x = 120

x = 120/3 = 40

Next, we find the number of pigs;

Pigs = 2/5 * 40

Pigs = 80/5 = 16 pigs

5 0
3 years ago
5. A store clerk moved a 4.4-kg box of soap without acceleration along a shelf by pushing it with a horizontal force of magnitud
lesantik [10]

The box moved 0.73 m

<u>Explanation:</u>

Given data,

Magnitude 8.1 N Work on the box 5.9 J Clerk move a 4.4 Kg

Distance= work done on the box / Horizontal force on the magnitude

              = 5.9/8.1

               =0.728

Distance =0.73 m

The box moved 0.73 m

5 0
3 years ago
A student pushes a laptop cart down the hallway by applying 20 Newtons force. The student pushes it 10 meters and
noname [10]

Answer:

None.

Explanation:

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3 years ago
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