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3 years ago

How does a sample of water at 311 K compare to a sample of water at 295 K?

Physics

1 answer:

Debora [2.8K]3 years ago

6 0

Answer:

it's 310 K

Explanation:

If you assume that no heat is lost to the surroundings, then you can say that the heat lost by the hotter sample will be equal to the heat absorbed by the cooler sample.

Now, the equation that establishes a relationship between heat lost or gained and change in temperature looks like this

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A ball is dropped from a height of 20m and renounce with the velocity which is 3/4 of d velocity with which it hits the ground.

Mashutka [201]

Answer:

1.73 seconds

Explanation:

The velocity the ball first hits the ground with is:

v² = v₀² + 2aΔx

v² = (0 m/s)² + 2 (-10 m/s²) (-20 m)

v = -20 m/s

The velocity it rebounds with is 3/4 of that in the opposite direction, or 15 m/s.

The time it takes to return to the ground is:

Δx = v₀ t + ½ at²

0 = (15 m/s) t + ½ (-10 m/s²) t²

0 = t (15 − 5t²)

t = √3

t ≈ 1.73 seconds

3 0

3 years ago

In this week's experiment, you send an unpolarized light beam through two polarizers in series. You orient the first polarizer s

g100num [7]

Answer:

Part a)

$\theta = 90 degree$

so the polarization axis of two polarizers must be at 90 degree

Part b)

$\theta = 20 + 14.3 = 34.3 degree$

(vi) set the second polarizer so that its angular scale reads 34.3 degrees.

Explanation:

Part 1)

As per law of Malus we know that the intensity of light coming from the second polarizer and the intensity of the light from first polarizer is related as

$I = I_o cos^2\theta$

now we know that we rotate the second polarizer till the intensity of the light becomes zero

so we will have

$I = 0$

so we will have

$\theta = 90 degree$

so the polarization axis of two polarizers must be at 90 degree

Part b)

when two axis are inclined at 90 degree then scale reads 104.3 degree

so here the scale exceeds the reading by

$\Delta \theta = 104.3 - 90 = 14.3$

so in order to make them inclined at 20 degree we will have

$\theta = 20 + 14.3 = 34.3 degree$

(vi) set the second polarizer so that its angular scale reads 34.3 degrees.

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4 years ago

How many time zones does Earth have?

otez555 [7]

Earth has 24 time zones

6 0

3 years ago

Read 2 more answers

What is the lowest level of sound that can be detected by human hearing? 0 Hz 10 Hz 20 Hz 100 Hz

maxonik [38]

These choices are not "levels" of sound. They're frequencies of sound.

The lower limit of audible frequency is usually considered to be 20 Hz.
But there are some people with ears that can hear 10 Hz, and others ...
particularly the elderly ... who can't hear anything below 100 Hz.

The question is a rather poor one.

8 0

4 years ago

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A spherical balloon has a diameter of 10 ft. The average specific volume of the air inside is 15.1 ft3 /lb. Determine the weight

lana66690 [7]

Answer:

hmu on snap dylan_2120

Explanation:

7 0

3 years ago