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3 years ago

The higher the pressure on a liquid, the higher its boiling point temperature. true false

2 answers:

6 0

True.

At the surface of the earth for example, the atmospheric pressure is 1 atmosphere, and water boils at 100°C, but at lower atmospheric pressure say at hills or mountains water boils at a lesser temperature than 100°C.

Hence the higher the pressure on a liquid, the higher the temperature.

Alika [10]3 years ago

3 0

True, p1/t1=p2/t2. Pressure is related to temperature at which it boils so pressure does affect the boiling point.

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Which can give off more heat: a glass full of hot water, or a pitcher full of hot water that has the same temperature?

inessss [21]

Answer:

Explanation:

3 0

3 years ago

Read 2 more answers

A train is moving toward the station at a speed of 25 m/s. Its horn emits a sound of frequency 600 Hz. (a) Calculate the frequen

MissTica

(a) 646.9 Hz

The formula for the Doppler effect is:

$f'=\frac{v+v_o}{v-v_s}f$

where

f = 600 Hz is the real frequency of the sound

f' is the apparent frequency

v = 345 m/s is the speed of sound

$v_o = 0$ is the velocity of the observer (zero since it is stationary at the station)

$v_s = +25 m/s$ is the velocity of the source (the train), moving toward the observer

Substituting into the formula,

$f'=\frac{345 m/s+0}{345 m/s-25 m/s}(600 Hz)=646.9 Hz$

(b) 20.1 m/s

In this case, we have

f = 600 Hz is the real frequency

f' = 567 Hz is the apparent frequency

Assuming the observer is still at rest,

$v_o = 0$

so we can re-arrange the Doppler formula to find $v_s$ , the new velocity of the train:

$f'=\frac{v}{v-v_s}f\\\frac{f}{f'}=\frac{v-v_s}{v}\\\frac{f}{f'}v=v-v_s\\v_s = (1-\frac{f}{f'})v=(1-\frac{600 Hz}{567 Hz})(345 m/s)=-20.1 m/s$

and the negative sign means the train is moving away from the observer at the station.

6 0

3 years ago

How is thermal energy from the sun distributed on Earth ?

Mrac [35]

Conduction and convection both require some material substance
to move heat from one place to another, and there's none of that
between the sun and Earth.

The only way for thermal energy to move from place to place with
nothing in between is by the process of radiation, and that's how
it gets here from the sun.

3 0

3 years ago

8. Gravity pulls a skydiver down as air

sweet [91]

Answer:

Air resistance is pushing up on the parachute and force of gravity is pulling down so she slows down. This increases friction which slows free fall down. So when the skydiver reaches terminal velocity, the force of gravity is balance by air resistance. But when the forces are balance, there is no acceleration.

8 0

3 years ago

a uniform electric field E=15 N/C points downwards. A particle with charge q=-0.15 C is placed in the electric field. What is th

Alex17521 [72]

Answer:

2.25 N upwards

Explanation:

Answer:

800 N/C to the right

Explanation:

The equation that relates force on a charge, electric field and charge is

$F=qE$

where

F is the force acting on the charge

q is the charge

E is the electric field

In this problem, we have

$E=15 N/C$ is the electric field

$q=-0.15 C$ is the charge

Substituting into the formula, we find the force

$F=(-0.15 C)(15 N/C)=-2.25 N$

Concerning the direction:

- The electric field and the force have same directions if the charge is positive

- The electric field and the force have opposite directions if the charge is negative

Here the charge is negative, so the electric field has opposite direction to the force: therefore, it must be upwards.

3 0

3 years ago