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lana [24]
3 years ago
15

A slice of pizza has 500 kilocalories. If we could burn the pizza and use all the heat to warm a 50 liter container of cold wate

r, what would be the approximate increase in the temperature of the water?
Physics
1 answer:
quester [9]3 years ago
4 0

Answer:

10 degree C

Explanation:

Q = 500 kcal = 500 x 1000 x 4.186 J = 2.1 x 10^6 J

V = 50 liter

m = Volume x density = 50 x 10^3 x 1000 = 50 kg

Let ΔT be the rise in temperature.

Specific heat of water = 4186 J/kg C

Q = m x c x ΔT

2.1 x 10^6 = 50 x 4186 x ΔT

ΔT = 10 degree C

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Using a scale of 1 cm to represent 10 N, find the size and
xz_007 [3.2K]
The size of the resultant is given by using pythagoras:

C^2 = A^2 + B^2

Since the 30N force and the 40N force act perpendicular to one another.

So: C = sqrt[(30)^2 + (40)^2]

C = 50N and, therefore, may be represented using 5cm

Since all we have as reference are the 2 initially given forces, let's use the angle between the resultant force and one of them to determine the resultants direction:

Taking the 40N force as a baseline (you can imagine it being horizontal).

Since the 40N force is a horizontal projection of the 50N resultant force:

40N = 50N*cos(theta) ; where theta is the angle formed between them

Theta is approximately 36,87° and that is the direction of the resultant force taken with the 40N forces direction as reference.

You can also graphically establish this direction by simply drawing the lines in scale on a piece of paper.


4 0
3 years ago
A pendulum is swinging back and forth with a period of 2.0 seconds here on Earth. This pendulum is then brought to the Moon, whe
Kryger [21]

Answer:

A greater period.

Explanation:

The period of a simple pendulum is given by the following formula:

T = 2\pi \cdot \sqrt{\frac{l}{g} }

Where:

l - Length of the pendulum

g - Gravity constant

Since acceleration due to gravity is smaller in the Moon, period will be greater.

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2 years ago
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