PHYSICS HIGH SCHOOL

A car travels 10 miles East in 30 minutes. What is its velocity in miles per hour?

Answers

Answer 1
Answer:

30min=30/60hr=0.5hr

velocity=distance/time=10mile/0.5hr=20 miles per hour East
Answer 2
Answer:

There are 60 minutes in an hour so 30 minutes is 0.5 hour.

Velocity is equal to displacement / time

= 10 miles East / 0.5 hour

= 20 miles per hour East

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Which activity will create tension in the legs

Answers

running is one activity riding a bicycle too

1. A substance which allows visible light to pass through freely is ______. A. opaque B. reflective C. transparent D. translucent2. A substance can be opaque to certain wavelengths of electromagnetic radiation, but transparent to others. A. True B. False
3. _______ is when either the vertical or the horizontal component of light waves is eliminated.

A. Refraction
B. Scattering
C. Transmission
D. Polarization

Answers

1. Transparent
2. True
3. Polarisation

a car traveling at 40m/s starts to decelerate steadily. it comes to a complete stop in 12 seconds. what is the acceleration?

Answers

Velocity - v =0 m/s,

initial velocity - v(0)= 40 m/s

a - acceleration,

time - t = 12 s.

v=v(0) - at

0 = 40m/s - a*12s

12a = 40

a = 3.3 m/s²

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged.
B) It gains protons and becomes positively charged.
C) The number of positive and negative charges can be the same.
D) It has to be a metal.
E) There is no change in the distribution of the charge in the object.

Answers

Answer: Option C: The number of positive and negative charges can be same.

A substance is said to be polarized when there is non-uniform distribution of electric charge. When there gain or loss of electrons, ions are formed. It is not necessary that polarized object is metal. For example, Water is polarized. The oxygen atoms have partial negative charge and hydrogen atoms have partial positive charge.

Answer:

c

Explanation:

100%

The cheetah, which is the fastest land mammal, can accelerate from 0.0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units of mph/sec.

Answers

Initial velocity of Cheetah(V1) = 0.0 mi/hr
Final velocity of Cheetah(V2) = 70 mi/hr
Time for acceleration(T) = 3 seconds.
We know the formula
Accelaration(A) = Velocity/Time
So
A = (V2 -V1)/T
   = (70 -0)/3
   = 70/3
   = 23.33mph/sec
So the accelaration of the Cheetah is 23.33 mph/sec.

Heat is a transfer of thermal energy from one object to anther because of a difference in?

Answers

Because of a difference in temperature.

temperature is the answer
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