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KengaRu [80]
3 years ago
7

What energy conversion takes place when a solar cell is used to light a street lamp? ​

Physics
2 answers:
tia_tia [17]3 years ago
8 0

Answer:

Explanation:

Electrical energy is the correct answer

krok68 [10]3 years ago
3 0

Answer:

Is B

Explanation:

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What is the acceleration of a car at rest that speeds up to 75m/s over 25 seconds?
Yuki888 [10]
It’s a because I just did it
6 0
3 years ago
A 120-meter-long ski ift carries skiers from a station at the foot of a slope to a second station 40 m above. what is the IMA (i
Pepsi [2]
The ideal mechanical advantage (IMA) of an inclined plane is given by:
IMA =  \frac{L}{h}
where L is the length of the inclined plane while h is the height.
In our problem, L=120 m and h=40 m. Therefore, the IMA of the ski lift is
IMA= \frac{120 m}{40 m}=3
7 0
4 years ago
3. A 40-gram ball of clay is dropped from a height, h, above a cup which is attached to a spring of spring force constant, k, of
zheka24 [161]

Answer:

the maximum speed of the ball is 12.65 m/s

Explanation:

Given;

mass of the ball, m = 40 g = 0.04 kg

spring constant, k = 25 N/m

Apply the principle of conservation of energy;

The Elastic potential energy of the spring will be converted into Kinetic of the ball;

\frac{1}{2} kx^2 = \frac{1}{2} mv^2\\\\ kx^2 = mv^2\\\\v^2 = \frac{kx^2}{m} \\\\v = \sqrt{\frac{kx^2}{m}} \\\\v = \sqrt{\frac{(25)(0.506)^2}{0.04}} \\\\v = \sqrt{160.0225} \\\\v = 12.65 \ m/s

Therefore, the maximum speed of the ball is 12.65 m/s

4 0
3 years ago
How far will a freely falling object fall from rest in five seconds? six seconds?
Vanyuwa [196]
Distance = 1/2*gravity*velocity^2 
<span>So plugging: 1/2 * 9.8 * 25 = 122.5units
 and is six second
</span><span>Distance = 1/2*gravity*velocity^2 
</span><span>So plugging: 1/2 * 9.8 * 36= 176.4 units</span>
4 0
3 years ago
Maureen is training for a backpacking trip. Which of the following training plans follows the FITT
lawyer [7]

Answer:

The answer is "Walk three days a week, gradually adding distance and hills."

Explanation:

The FITT Principle <u>guides a person in becoming a fitter version of himself by following a particular frequency, intensity, time and type of exercise in order to achieve his goals.</u>

<u>Frequency</u>- this refers to how often a person should do an exercise. For example, 5 times a week of intense core workout.

<u>Intensity</u>- this refers to the person's vigour or strength in doing the workout. This depends whether the person is doing a high-intensity or a low-intensity exercise.

<u>Time</u>- this refers to the length of a person's exercise. This will largely depend on every individual's fitness level.

<u>Type of Exercise</u>- this refers to the exercise that a person should incorporate in his training<u> in order to avoid injuries of using the same muscles over and over again.</u>

Among the choices above, it is only the second choice (Walk three days a week, gradually adding distance and hills) that follows the FITT principle. Walking shouldn't be kept at the same pace and distance for many weeks, since it results to<em> boredom and overuse injuries. </em>This will also lead to a plateau when it comes to people who are trying to lose weight because the body has already well-adjusted to the exercise and cannot be challenged anymore.

<em>Gradually increasing the distance and hills will allow the person to be more challenged </em>and<em> </em>will also increase his desire to workout (because he is seeing results).

6 0
3 years ago
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