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3 years ago

14

A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 5 ft/s along

a straight path. How fast is the tip of his shadow moving when he is 40 ft from the pole? (a) What quantities are given in the problem? (b) What is the unknown? (c) Draw a picture of the situation for any time t. (d) Write an equation that relates the quantities. (e) Finish solving the problem.

1 answer:

snow_lady [41]3 years ago

5 0

Answer:

d) or (e) but It'll most likely be (d) because their is an option of writing a nother equation related to this,so d. final answer. Good Luck

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What amount of heat is required to raise the temperature of 200 g of water by 15°C (the specific heat of water is 1 cal/g°C)

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Answer:

Heat energy required (Q) = 3,000 J

Explanation:

Find:

Mass of water (M) = 200 g

Change in temperature (ΔT) = 15°C

Specific heat of water (C) = 1 cal/g°C

Find:

Heat energy required (Q) = ?

Computation:

Q = M × ΔT × C

Heat energy required (Q) = Mass of water (M) × Change in temperature (ΔT) × Specific heat of water (C)

Heat energy required (Q) = 200 g × 15°C × 1 cal/g°C

Heat energy required (Q) = 3,000 J

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When water waves undergo diffraction, state what is the

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Three Carnot engines operate between the following temperature limits.

Kipish [7]

Answer:c>a>b

Explanation:

Given

All the engine extracts same amount of heat(Q) from High-temperature reservoir

For a) 400 and 500 K

$\eta _{engine}=1-\frac{T_L}{T_H}$

$\eta _{engine}=\frac{work\ supplied}{heat\ supplied}$

$1-\frac{400}{500}=\frac{W_a}{Q}$

$W_a=\frac{Q}{5}$

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Complete Question

Find the ratio of intensities in 4 different sets of red to violet spectral satellites in Raman scattering spectra of CCl4 molecules at T=27C temperature if corresponding resonant infrared frequencies (equivalent to frequencies of nuclei vibrations) of CCl4 molecule are 217, 315, 457 and 774 cm-1 . (Note: Wavenumber N in cm-1 is defined as $N=1/\lambda\ cm^{-1}$ )

Answer:

The ratio of intensities is $I_1 : I_2 : I_3 : I_4 = 217 : 315 : 457 : 774$

Explanation:

From the question we are told that

The number of sets of satellite is $n = 4$

The temperature is $T = 27 ^oC$

The resonant infrared frequencies are $f_1 = 217 cm^{-1}$

$f_2 = 315 cm^{-1}$

$f_3 = 457 cm^{-1}$

$f_4 = 774 cm^{-1}$

From the question we see that the wave number also has a unit of $cm^{-1}$ hence the value of the wave numbers of the molecule are

$N_1 = 217 cm^{-1}$

$N_2 = 315 cm^{-1}$

$N_3 = 457 cm^{-1}$

$N_4 = 774 cm^{-1}$

Generally intensity is mathematically represented as

$I = \frac{nhc}{A \lambda }$

Here we see that I varies inversely with wavelength i,.e

$I \ \ \alpha \ \ \frac{1}{\lambda }$

From the question we are told that the wave number is mathematically represented as

$N = \frac{1}{\lambda }$

Therefore

$I \ \ \alpha \ \ N$

This implies that the ratio of intensity in first set to that of second set to that of third set to that of fourth set is equal to the ratio of the wavenumber in the first set to that of the second set to that of third set to that of fourth

This is mathematically represented as

$I_1 : I_2 : I_3 : I_4 = N_1 : N_2 : N_3 : N_4$

Substituting values

$I_1 : I_2 : I_3 : I_4 = 217 : 315 : 457 : 774$

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