PHYSICS HIGH SCHOOL

An elevator weighing 6,000 N moves up a distance of 10.0 meters in 30.0 seconds. a. How much work did the elevator’s motor do? b. What was the power of the elevator’s motor in watt and in horsepower?

Answers

Answer 1
Answer: Assume that work is equal to force x distance or w=fd. The force here is 6,000n and distance is 10.0 so therefore w=(6000n)(10.0m) and use that to do p=wt (power = work x time

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6. What makes an object float rather than sink?

Answers

An object will float in any solution rather than sink, when the density of the object is less than that of the solution in which it is floating. This statement does not mean that the object has to be lighter in weight than the fluid in which it is floating. A great example is a ship floating in water. I hope the answer helps you.

What sometimes occurs when reclaimed water is used in agriculture?

Answers

I remember this from IPC! If farmers used reclaimed water, there is a chance of chemical contamination in the water can damage the plants, if not kill them entirely! :D

Which of the following types of energy originates below Earth's surface?A. electrical energy
B. geothermal energy
C. mechanical energy
D. electromagnetic energy

Answers

Geothermal energy. Electromagnetic energy originates at the sun (think UV rays; they are part of the electromagnetic spectrum). Electrical energy technically can be anywhere, as long as there are positive and negative charges. Mechanical energy is like a generator or an engine; there is always something working to get things done/made. I hope this answer and these explanations helped!

To test the hypothesis that plants grow faster in green light, a student set up 3 of the same type of plants. She placed the first plant under a green light, the second plant under a regular light bulb, and the third plant under a red light. What is the dependent variable in this experiment?

Answers


The dependent variable is the speed of plant growth, and the-plant's general health and welfare.

The hypothesis is defective.  It should talk about whether the plant is
DEPRIVED of any green light.  The way the experiment is described,
the results won't be clear.  The "regular" light bulb has a lot of green
wavelengths in it, along with a lot of other stuff that the plant may or
may not be interested in.  So the plant's response to the green light
AND the 'regular' light may be very similar.
 

How do you change Newtons into kilograms

Answers

You don't.  You can only convert units when they're both units of the
same physical quantity.  In this case, 'newton' is a unit of force, but
'kilogram' is a unit of mass. Those are not the same physical quantity,
so they don't convert.

The closest you can get is to find the weight of some mass when you know
the gravity in the place where the mass is.  The weight of some mass is

                   (mass in kilograms) x (gravity in meters per second²) 

and the answer is in newtons.

On Earth, the gravity is 9.8 meters per second², so each kilogram of mass
weighs 9.8 newtons.

In other places, like on the moon or on Mars, the gravity is different, so
a kilogram weighs something different.

A stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. Compared to the emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a(1)longer wavelength
(2)higher speed
(3)longer period
(4)higher frequency

Answers

Answer: The correct answer is higher frequency.

Explanation:  

Doppler's effect is defined as the apparent change in the frequency of an electromagnetic wave due to the relative motion of an observer and source.

In the given problem, a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. In this case, there will be higher frequency.

If a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving away the officer. In this case, there will be smaller frequency  but will have a longer wavelength.

Therefore, the radio waves reflected from the vehicle and received by the radar gun have a higher frequency.

The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.

What is the Doppler effect?

A sudden change in the frequency due to the distance between the objects and source is explained by the doppler effect.

As the source and observer travel toward each other, the frequency of sound, light, or other waves increases or decreases.

The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.

Hence option 4 is correct.

To learn more about the doppler effect refer to the link;

brainly.com/question/15318474
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