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3 years ago

A train crosses a bridge that is 1300 m long in 1 minute and 5 seconds.

Physics

1 answer:

Nat2105 [25]3 years ago

3 0

Answer:

I'm pretty sure it's 20m/s because 1300m divided by 65 seconds is 20 so I think it's 20m/s

Explanation:

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How much heat is needed to vaporize 10.00 grams of water at 100.0°C? The latent heat of vaporization of water is 2,259 J/g

Nata [24]

Answer:

Heat of vaporization will be 22.59 j

Explanation:

We have given mass m = 10 gram

And heat of vaporization L = 2.259 J/gram

We have to find the heat required to vaporize 10 gram mass

We know that heat of vaporization is given by $Q=mL$ , here m is mass and L is latent heat of vaporization.

So heat of vaporization Q will be = 10×2.259 = 22.59 J

8 0

3 years ago

Read 2 more answers

The forces in (Figure 1) are acting on a 4.3 kg object.

harina [27]

Answer:

19computer deaseas

Explanation:

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5 0

2 years ago

A 45.0 kg girl is standing on a 159 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat,

Ganezh [65]

Answer:

(a) $v_g_i=1.08\frac{m}{s}$

(b) $v_p_i=-0.3\frac{m}{s}$

Explanation:

According to the law of conservation of momentum:

$\Delta p=0\\p_i=p_f$

Initially, the girl and the plank are at rest. So, relative to the ice, we have:

$0=m_gv_g_i+m_pv_p_i\\v_p_i=-\frac{m_gv_g_i}{m_p_i}(1)$

(a) The velocity of the girl relative to the ice is:

$v_g_i=v_g_p+v_p_i(2)$

Here, $v_g_p$ is the velocity of the girl relative to the plank and $v_p_i$ is the velocity of the plank relative to the ice.

Replacing (1) in (2):

$v_g_i=v_g_p-\frac{m_gv_g_i}{m_p_i}\\v_g_i+\frac{m_gv_g_i}{m_p_i}=v_g_p\\v_g_i(1+\frac{m_g}{m_p})=v_g_p\\v_g_i=\frac{v_g_p}{1+\frac{m_g}{m_p}}\\v_g_i=\frac{1.38\frac{m}{s}}{1+\frac{45kg}{159kg}}\\v_g_i=1.08\frac{m}{s}$

(b) According to (2), the velocity of the plank relative to the surface of ice is:

$v_p_i=v_g_i-v_g_p\\v_p_i=1.08\frac{m}{s}-1.38\frac{m}{s}\\v_p_i=-0.3\frac{m}{s}$

The negative sing indicates that the plank is moving to the left.

3 0

3 years ago

In addition to producing images, ultrasound can be used to heat tissues of the body for therapeutic purposes. An emitter is plac

Dafna11 [192]

Answer:

The answer is Yes, the standing wave length with 5 anti-nodes will be created

Explanation:

To answer this question, we recall the frequencies of standing wave modes in a closed - closed tube of length (L).

The formula will now be:

Fₙ = n ( v/2L)

Where n = n is equal to the number of anti-nodes

and

lambda = 2L/n for standing waves in a closed tube where n is equal to the number of nodes

Now assuming the nodes are :

Where n = 1, 2, 3, 4, 5, ............

Now, we try to make "n" the subject of formula

Fₙ = n ( v/2L)

So therefore, the number of nodes produced will be

n = 2L Fₙ / v

2 x 0.55 x 10⁻² x 0.7 x 10⁶ / 1540

Calculating the above further, we arrive at = 5.

Now to answer the question,

The answer is Yes, the standing wave length with 5 anti-nodes will be created

7 0

3 years ago

Why do earthquakes at divergent plate boundaries not cause tsunamis?

oksano4ka [1.4K]

Answer:

Earthquakes and volcanoes generate the great majority of tsunamis, and the theory of plate tectonics explains the cause of earthquakes and volcanoes. ... The San Andreas fault in California occurs at this type of plate boundary. At divergent boundaries, plates move away from each other.

Explanation:

hope it helps you

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4 0

3 years ago