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charle [14.2K]
3 years ago
7

Which statement describes the energy transformation that occurs when a person eats a sandwich to gain energy for a long hike? O

A. Thermal energy is transformed into kinetic energy. B. Chemical energy is transformed into kinetic energy. O C. Thermal energy is transformed into chemical energy. o D. Chemical energy is transformed into potential energy.​
Physics
1 answer:
Nataly [62]3 years ago
7 0

Answer:chemical energy is transformed into kinetic energy

Explanation:

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JUST PLZ HELP!!! Why does the lightbulb in the right electrical circuit turn on but not the one on the left?
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8 0
2 years ago
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A bowling ball of mass m=1.7kg is launched from a spring compressed by a distance d=0.31m at an angle of theta=37 measured from
vodomira [7]

Answer:

k = 1 700.7 N/m

v0 = 9.8 m/s^2

Explanation:

Hello!

We can answer this question using conservation of energy.

The potential energy of the spring (PS) will transform to kinetic energy (KE) of the ball, and eventually, when the velocity of the ball is zero, all that energy will be potential gravitational (PG) energy.

When the kinetic energy of the ball is zero, that is, when it has reached its maximum heigh, all the potential energy of the spring will be equal to the potential energy of the gravitational field.

PS = (1/2) k x^2  <em>where x is the compresion or elongation of the spring</em>

PG = mgh

a)

Since energy must be conserved and we are neglecting any energy loss:

PS = PG

Solving for k

k = (2mgh)/(x^2) = ( 2 * 1.7 * 9.81 * 4.9 Nm)/(0.31^2 m^2)

k = 1 700.7 N/m

b)

Since the potential energy of the spring transfors to kinetic energy of the ball we have that:

PS = KE

that is:

(1/2) k x^2 = (1/2) m v0^2

Solving for v0

v0 = x √(k/m) = (0.31 m ) √( 1 700.7 N/m / 1.7kg)

v0 = 9.8 m/s^2

8 0
2 years ago
A hypothetical planet has a mass one-third of and a radius three times that of Earth. What is the acceleration due to gravity on
kap26 [50]

Answer:

F) The acceleration due to gravity is g/27

Explanation:

According to Newton gravitational law, the gravitational acceleration is directly proportional to the planet mass and inversely proportional to the square of distance.

Since our new planet has a mass of one-third of Earth's and radius 3 times of Earth's. This means the new planet is lighter and further away from the distance. This means g is first reduced by 3 due to smaller mass and then reduced by 9 due to square of 3 times the distance.

The gravitational acceleration on this new planet must be

\frac{g/3}{3^2}

\frac{g}{27}

So F) is the correct answer

6 0
2 years ago
A woman is sitting at a bus stop when an ambulance with a siren wailing at 317 Hz approaches at 69 miles per hour (mph). Assume
Solnce55 [7]

Answer:

a)30.67 m/s

b)348,12 Hz

c)32,34 m/s

d)289,69 Hz

Explanation:

a)

To convert 69 mph to m/s we have:

69\times 1.6=110.4\, Km/h=\frac{110.4}{3.6}=30.67 \, m/s

b)

For a resting receiver and an approaching source we have the following Doppler formula:

f=f_0\frac{c}{c-v_s}

where v_s is the source, and c is the speed of sound, f the perceived frequency and f_0 the frequency as perceived by the source. Plugging all the relevant values we get:

f=348,12 \, Hz

c)

Using the same formula as above and solving for v_s we have:

v_s=c\frac{f-f_0}{f}=32,34 \, m/s

d)

Now we have another Doppler formula for a source that is moving away from the receiver:

f=f_0\frac{c}{c+v_s}=289.69 Hz

3 0
3 years ago
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