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3 years ago

15

A chemical reaction occurs. Which of the following would indicate that energy is transformed during the reaction? A. an electric

al charge is produced B. heat is produced C. light is produced D. all of these

1 answer:

erastovalidia [21]3 years ago

7 0

The Answer is B

Hope this helps

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At what distance above Earth would a satellite have a period of 125 minutes

mash [69]

Answer:

If a satellite orbiting the Earth has a period of 125 min, then it must be 1.90 x 106 m above the Earth's surface.

Explanation:

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4 years ago

Assume that a force acting on an abject is given by F⃗ = a x ihat + b y jhat, where the constants a = 3.0N/m and b = 4.0N/m. Det

tamaranim1 [39]

Answer:

W = 950J

Explanation:

From the problem we have these values:

F = [3x,4y]N

ΔX = 10m

ΔY = 20m

$W = \int\limits {F} \, dr$

$W = \int\limits^{10}_0 {3x} \, dx +\int\limits^{20}_0 {4y} \, dy$

$W = 150 J+800 J$

$W = 950 J$

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3 years ago

As you stand near a railroad track, a train passes by at a speed of 31.7 m/s while sounding its horn at a frequency of 218 Hz. W

Darya [45]

Explanation:

Given that,

Frequency of train horn, f = 218 Hz

Speed of train, $v_t = 31.7 m/s$

The speed of sound, V = 344 m/s (say)

The speed of the observed person, $V_o=0\ m/s$

(a) When the train approaches you, the Doppler's effect gives the frequency as follows :

$f'=f(\dfrac{V}{V-v_t})\\\\f'=218\times (\dfrac{344}{344-31.7})\\\\f'=240.12\ Hz$

(b) When the train moves away from you, the Doppler's effect gives the frequency as follows :

$f'=f(\dfrac{V}{V+v_t})\\\\f'=218\times (\dfrac{344}{344+31.7})\\\\f'=199.6\ Hz$

Hence, this is the required solution.

6 0

4 years ago

A uniform steel plate has an area of 0.819 m2. When subjected to a temperature difference between its sides, a heat current* of

Tju [1.3M]

Answer:

ΔT / Δx = 771 K/m

ΔT = 771 x 0.0475 = 36.62 k

Explanation:

P = 31700 W, A = 0.819 m^2, Δx = 0.0475 m, K = 50.2 W /m k

Use the formula of conduction of heat

H / t = K A x ΔT / Δx

So, ΔT / Δx = P / K A

ΔT / Δx = 31700 / (50.2 x 0.819)

ΔT / Δx = 771 K/m

Now

ΔT = 771 x 0.0475 = 36.62 k

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3 years ago

What role if any does air resistance have on your results

djyliett [7]

When air resistance acts, acceleration during a fall will be less than g because air resistance affects the motion of the falling objects by slowing it down. ... Air resistance depends on two important factors - the speed of the object and its surface area.

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3 years ago