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3 years ago

All heat engines involve _____. the refrigeration cycle evaporation and condensation combustion

Physics

2 answers:

AURORKA [14]3 years ago

7 0

The answer is Combustion took the test and made a 93

pishuonlain [190]3 years ago

4 0

Combustion is the answer i just took the test

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Whoever gets this right gets brainlyess answer and it's worth 10 points :)

Gelneren [198K]

A is only the area of one tile. It wants the area of the whole floor.
area of parallelogram is b*h=0.952. There are 9500 of them so 0.952*9500=904.4 (answer c)

5 0

4 years ago

Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.210-kg ball with zero net charge was

tigry1 [53]

Answer:

$\Delta V=316167V$

Explanation:

The difference of electric potential between two points is given by the formula $\Delta V=Ed$ , where d is the distance between them and E the electric field in that region, assuming it's constant.

The electric field formula is $E=\frac{F}{q}$ , where F is the force experimented by a charge q placed in it.

Putting this together we have $\Delta V=\frac{Fd}{q}$ , so we need to obtain the electric force the charged ball is experimenting.

On the second drop, the ball takes more time to reach the ground, this means that the electric force is opposite to its weight W, giving a net force $N=W-F$ . On the first drop only W acts, while on the second drop is N that acts.

Using the equation for accelerated motion (departing from rest) $d=\frac{at^2}{2}$ , so we can get the accelerations for each drop (1 and 2) and relate them to the forces by writting:

$a_1=\frac{2d}{t_1^2}$

$a_2=\frac{2d}{t_2^2}$

These relate with the forces by Newton's 2nd Law:

$W=ma_1$

$N=ma_2$

Putting all together:

$N=W-F=ma_1-F=ma_2$

Which means:

$F=ma_1-ma_2=m(a_1-a_2)=m(\frac{2d}{t_1^2}-\frac{2d}{t_2^2})=2md(\frac{1}{t_1^2}-\frac{1}{t_2^2})$

And finally we substitute:

$\Delta V=\frac{Fd}{q}=\frac{2md^2}{q}(\frac{1}{t_1^2}-\frac{1}{t_2^2})$

Which for our values means:

$\Delta V=\frac{2(0.21Kg)(1m)^2}{7.7\times10^{-6}C}(\frac{1}{(0.35s)^2}-\frac{1}{(0.65s)^2})=316167V$

7 0

3 years ago

A boy is listening to the radio. The loudspeaker plays a musical note by vibrating 256 rimes esch second. How many times does th

Svet_ta [14]

Answer:

f_tympanum = 256 Hz.

Explanation:

The eardrum is the vibrating membrane of the human ear, it works by resonance, that is, an external stimulus (force) makes it vibrate, as the eardrum is extremely light it can vibrate at the same frequency of the incident sound.

Consequently if the incident vibration is f = 256 hz, the eardrum resonates at the same frequency

f_tympanum = 256 Hz.

As a reference the response of the eardrum goes from f = 20 Hz f = 20000 Hz

6 0

4 years ago

what is the specific heat capacity of silver metal if 55.00g of the absored 47.3 calories of heat and temperature rise 15.°c

igor_vitrenko [27]

Answer:

$0.240 J/(g^{\circ}C)$

Explanation:

When an amount of energy Q is supplied to a sample of substance of mass m, the temperature of the substance increases by $\Delta T$ according to the equation

$Q=mC_s \Delta T$

where

$C_s$ is the specific heat capacity of the substance

In this problem, we have:

m = 55.0 g is the mass of the sample of silver

$Q = 47.3 \cdot 4.184 = 197.9 J$ is the amount of energy supplied to the sample

$\Delta T = 15^{\circ}C$ is the change in temperature of the sample

Solving the equation for $C_s$ , we find the specific heat capacity of silver:

$C_s = \frac{Q}{m \Delta T}=\frac{197.9}{(55.0)(15)}=0.240 J/(g^{\circ}C)$

3 0

4 years ago

If a new star appeared in our solar system that was larger and heavier than the Sun, the planets would MOST LIKELY A) orbit the

s344n2d4d5 [400]

D. since the star would be larger than the sun, having more mass, its gravitational pull would be stronger thus pulling the planets into it. hope that helped!

7 0

4 years ago

Read 2 more answers