PHYSICS HIGH SCHOOL

Which of the following is the best example of uniform circular motion? A.The motion of the second hand on a clock
B.A child swinging on a park swing
C.A golf ball after it has been hit off the tee
D.A skier curving back and forth across a wide slope

Answers

Answer 1
Answer: The only choice that describes ANYTHING moving in a circle is ' A '.

The park swing and the skier go back and forth. 
The golf ball goes up and then down, once.

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Which is related to air pollution in Mexico City? A. burning fossil fuels

B. using hydropower

C. collecting natural gas

D. using biofuels

Answers

A. Burning fossil fuels
Burning fossol fuels. Why? Because, when these fuels are burned, it sends pollution into the air, polluting the area around it,

A coffee maker uses 7 amps of current and 110 volts. How much power does it use?

Answers

Power=Amperage*Voltage
P=I*V
now power= 7amps*110volts
Power coffee maker uses is 770 watts.

Answer: The correct answer is 770 W.

Explanation:

The expression of the power in terms of potential and current is as follows;

P=VI

Here, P is the power, V is the potential and I is the current.

It is given in the problem that A coffee maker uses 7 amps of current and 110 volts.

Calculate the power of a coffee maker.

P=VI

Put I= 7 A and V= 110 V.

P=(110 V)(7 A)

P= 770 W

Therefore, the power of the coffee maker is 770 W.

An automobile having a mass of 2000 kg deflects its suspension springs 0.02 m under static conditions. Determine the nafural frequency of the automobile in the vertical direction by assuming damping to be negligible.

Answers

The natural frequency of the automobile in the vertical direction is 3.52 Hertz

Static equilibrium

Static equilibrium refers to the physical state in which the components of a system are at rest and the net force acting through the system is equal to zero.

In static equilibrium:

kd = mg

where;

k = effective spring constant of the spring.

mg = the weight of the car

d = static deflection.

also K = mω²

where ω is angular velocity

m is mass

Thus, mω²d = mg

ω²d = g

ω = √g/d

ω = g/d

ω  = √9.8/0.02

ω = 22.15 rad/sec

Converting to Hertz unit for frequency

1 rad/s = 0.1591 Hertz

22.14 rad/s = 22.14 * 0.1591

22.14 rad/s = 3.525 hertz

Therefore, the natural frequency of the automobile in the vertical direction is 3.52 Hertz

Learn more about natural frequency at: brainly.com/question/11753773

Answer:Frequency = 3.525 Hertz

Explanation:In static equilibrium, kd =mg

Where k= effective spring constant of the spring.

mg= The weight of the car.

d= static deflection.

Therefore, w =SQRTg/d

w = SQRT 9.81/0.02

w= 22.15 rad/sec

Converting to Hertz unit for frequency

1 rad/s = 0.1591

22.15rad/s=?

22.15 × 0.1591= 3.525 hertz

The Coriolis effect is the result of which of the following? A. winds spinning off the equator B. the rotation of the earth on its axis C. the different air movements north and south of the equator D. the friction that slows down winds near the earth’s surface

Answers

The answer is B. the rotation of the earth on its axis.


Coriolis effect is the effect of the Earth's rotation on theoceans and atmosphere. It is the cause of deflection to the right in thenorthern hemisphere and to the left in the southern hemisphere. Thus, in thenorthern hemisphere, gyres spin clockwise, and in the southern hemisphere, gyres spin counter-clockwise.

Answer:

B. the rotation of Earth on its axis

Explanation:

K12

What happened to a apple's weigh as the plane rose up toward the sky?

Answers


Okay, I don't know if this question is supposed to be a trick question or not. The weight of the apple does not change as the plane travels up the atmosphere, but the MASS changes. Weight doesn't change no matter what environment you're in, but the mass changes in different environments. In this case, the weight is constant but the mass is decreasing as you go higher up.

A center-seeking force related to acceleration is _______ force.A. centripetal
B. centrifugal
C. gravitational
D. frictional

Answers

A center-seeking force related to acceleration is centripetal force. The answer is letter A. The rest of the choices do not answer the question above.
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