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Lisa [10]
3 years ago
5

What is the specific heat of silver if the temp ig a 15.4g sample of silver is increased frin 20 degrees celsius to 31.2 degrees

celsius when 40.5 Joules of heat is added?
Physics
1 answer:
Genrish500 [490]3 years ago
4 0

heat = mass x spec heat x temp rise

40.5=15.4x10^-3xspec heatx11.2

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Two books are located 1 m above the surface of the Earth. The first has a mass of 2 kg; the second has a mass of 1 kg. Which sta
stepladder [879]
B, the acceleration due to gravity is 9.8m/s/s regardless of mass

3 0
3 years ago
An air conditioner runs 15 minutes each hour on a hot summer day. It is on a 240 volt circuit and uses 21 amps. Rate is $.10/kWh
Helen [10]

Answer:

Approximately \$ 3.02.

Explanation:

Note that the electric rate in this question is in the unit dollar-per-{\rm kWh}, where 1\; {\rm kWh} is the energy to run an appliance of power 1\; {\rm kW} for an hour.

Number of minutes for which the air conditioner is running in that day: 15 \times 24 = 360\; \text{minute}. Apply unit conversion and ensure that this time is measured in hours (same as the unit of the electric rate.)

\begin{aligned} \text{time} &= 360\; \text{minute} \times \frac{1\; \text{hour}}{60\; \text{minute}} = 6\; \text{hour} \end{aligned}.

The power of this air conditioner is:

\begin{aligned} \text{power} &= \text{voltage} \times \text{current} \\ &= 240\; {\rm V} \times 21\; {\rm A} \\ &= 5040\; {\rm W} \\ &= 5.04\; {\rm kW} \end{aligned}.

Thus, the energy that this air conditioner would consume would be:

\begin{aligned}\text{energy} &= \text{power} \times \text{time} \\ &= 5.04\; {\rm kW} \times 6\; \text{hour} \\ &= 30.24\; {\rm kWh} \end{aligned}.

At a rate of 0.1 dollar-per-{\rm kWh}, the cost of that much energy would be approximately 3.02 dollars (rounded to the nearest cent.)

6 0
2 years ago
Which statement is true about an object moving in a circular motion due to centripetal force, F, when the mass is doubled? A. It
Allushta [10]
Force = [Mass x (velocity)^2]/Radius
Therefore,
The mass and the force are directly proportional.If you double the mass,the force will be doubled too.

A. Its centripetal force would <span>be doubled.</span>
3 0
3 years ago
An incandescent bulb is supplied with
Serga [27]

Answer:

Efficiency = 5%

Explanation:

Given that,

Supplies energy to the bulb = 100 J

Transferred energy by the bulb = 5 J

We need to find the efficiency of the bulb. It can be given by "

\eta=\dfrac{\text{useful energy out}}{\text{useful energy in}}\times 100\\\\=\dfrac{5}{100}\times 100\\\\=5\%

So, the efficiency of the bulb is 5%.

8 0
3 years ago
2. A 2,000 kg rocket is launched 12 km straight up at a constant acceleration into the sky at which point the rocket is travelli
Mice21 [21]

Answer:

797700000 J

Explanation:

From the question,

The work done by the rocket, is given as,

W = Ek+Ep............. Equation 1

Where Ek and Ep are the potential and the kinetic energy of the rocket respectively.

Ep = mgh............ Equation 2

Ek = 1/2mv²............. equation 3

Substitute equation 2 and equation 3 into equation 1

W = mgh+1/2mv².............. Equation 4

Where m = mass of the rocket, h = height, v = velocity of the rocket, g = acceleration due to gravity.

Given: m = 2000 kg, h = 12 km = 12000 m, v = 750 m/s, g = 9.8 m/s²

Substitute into equation 4

W = 2000(12000)(9.8)+1/2(2000)(750²)

W = 235200000+562500000

W = 797700000 J

6 0
3 years ago
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