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3 years ago

How Many Moons Does Each Planet Have?

1 answer:

6 0

Each planet has a different number of moons. Earth has only one, while planets like Mars have more (2). Even some planets have no moons (like Venus or Mercury).

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An engine does 25 J of work and exhausts 20 J of waste heat during each cycle. If the cold-reservoir temperature is 30 ∘C, what

hodyreva [135]

Answer:

T₂=659.25 K

Explanation:

Given that

W= 25 J

Qr = 20 J

T₁ = 20⁰ = 20 +273 = 293 K

The minimum temperature of the hot reservoir = T₂

If the engine is Carnot engine then

Qa= W+ Qr

Qa=25 + 20 J

Qa= 45 J

$\dfrac{Qa}{Qr}=\dfrac{T_2}{T_1}$

$T_2=\dfrac{Qa}{Qr}\times T_1$

$T_2=\dfrac{45}{20}\times 293\ K$

T₂=659.25 K

Therefore the temperature of hot reservoir will be 659.25 K

4 0

4 years ago

A 5.0-Ω resistor and a 9.0-Ω resistor are connected in parallel. A 4.0-Ω resistor is then connected in series with this parallel

Oliga [24]

Answer:

Explanation:

The current through the resistor is 0.83 A

Part b

The current through resistor is 0.53 A

Part c

The current through resistor is 0.30 A

4 0

3 years ago

Three balls are kicked from the ground level at some angles above horizontal with different initial speeds. All three balls reac

astra-53 [7]

Answer:

They all hit at the same time

Explanation:

Let the time of flight is T.

The maximum height is H and the horizontal range is R.

The formula for the time of flight is

$T=\frac{2uSin\theta }{g}$ ..... (1)

Te formula for the maximum height is

$H=\frac{u^{2}Sin^{2}\theta }{2g}$ .... (2)

From equation (1) and (2), we get

$\frac{T^{2}}{H}=\frac{\frac{4u^{2}Sin^{2}\theta }{g^{2}}}{\frac{u^{2}Sin^{2}\theta }{2g}}$

$\frac{T^{2}}{H}=\frac{8}{g}$

$T=\sqrt{\frac{8H}{g}}$

here, we observe that the time of flight depends on the maximum height and according to the question, the maximum height for all the three balls is same so the time of flight of all the three balls is also same.

8 0

3 years ago

A 25N force is applied to a bar that can pivot around its end. The force is r=0.75 m away from the end of an angle at 0= 30. wha

Alecsey [184]

Answer:

Explanation:

The formula for calculating torque τ = Frsin∅ where;

F = applied force (in newton)

r = radius (in metres)

∅ = angle that the force made with the bar.

Given F= 25N, r = 0.75m and ∅ = 30°

torque on the bar τ = 25*0.75*sin30°

τ = 25*0.75*0.5

τ = 9.375Nm

The torque on the bar is 9.375Nm

6 0

4 years ago

Which of the following elements is an alkali metal?

Scrat [10]

It is b. sodium because it is in group 1

6 0

3 years ago