PHYSICS HIGH SCHOOL

How many cars can fit in a football field?

Answers

Answer 1
Answer:

5211.6 Car can fit in a football field.

What is the dimension of football pitch?

The recommended dimensions of a football pitch are 105m x 68m, which is 7,140 sq meters.

The average length of a car is around 14.7 feet.

i.e. 1.37 sq meters

By dividing the football pitch by length of car,

= 7140/ 1.37

= 5211.6 Car

With no gaps of course.

Therefore,

In a football field 5211.6 cars can be fit without no gap.

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Answer 2
Answer: 100 cars can fit into a football field

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Polychlorinated biphenyls (PCBs) have been banned because they are an environmental hazard. Which of the following was NOT a reason for banning them?
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A cheetah runs 900 meters in 30 seconds. how fast is it going?
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A car traveling in a straight line has a velocity of 3.79 m/s at some instant. After 5.4 s, its velocity is 11.9 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2

Answers


|Acceleration| = (change in speed) / (time for the change)

Change in speed = (speed at the end) minus (speed at the beginning).

Change in speed = (11.9 m/s  -  3.79 m/s)  =  8.11 m/s

|Acceleration| = (8.11 m/s) / (5.4 sec) = 1.502 m/s² (rounded)

This solution is written in terms of speed and the absolute value
of acceleration.  The question gives no information regarding the
direction of motion at any time, so it's not possible to say anything
about velocity, or the direction of acceleration.

Which of the following has the greatest frequency? a loud middle c note a soft middle c note a note lower than middle c a note higher than middle c?

Answers

a note higher than middle c has the greatest frequency. Hence option D is correct.

What is Wave ?

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.

Hence option D is correct.

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Answer:

a note higher than middle c

Explanation:

How do I compute the resistance in ohms of a lead block 15 cm long and 0.10 cm2 in cross-sectional area. (ρ = 2.2 x 10-5 ohm-cm)

Answers

Resistance is also dependent on the length of a wire where it is expressed as the product of the resistive force and the length of the wire over the cross-sectional area of the wire. Calculation are as follows:

R= pL / A
R = 2.2 x 10^-5 x 15 / 0.10
R = 3.3 x 10^-3 ohms

2 QUESTIONS HELP PLZ...:/Which of the following is not part of the structure of a comet?

A. Coma
B. Head
C. Dust tail
D. Nucleus

How far can light travel in one year?

A. 300,000 km
B. 30 million km
C. 10 trillion km
D. 100 billion km

THANKS IF ANYONE CAN HELP =)

Answers

The first one is: head
Second one is: 10 trillion km

Which most likely could cause acceleration? Check all that apply.a flat road
wind
water movement
a hill
a stop light
*can be multiple answers*

Answers

Answer  

Wind  

Water movement  

A hill

Explanation.  

The question does not specify it is the acceleration of what is to be accelerated. So my answer will be general. Acceleration is the change of velocity with time.  

Wind can cause acceleration of sound. If the sound is travelling in the direction of sound, its speed wound increase. The reverse is also true.  

Water movement can also cause acceleration. When a bout is moving in the direction of water movement, then it will be expected that the resultant speed of the bout to be higher. If the bout was moving against the water movement, its speed would be decreased.  

A hill would reduce the speed of a moving vehicle. This is also an acceleration that is negative (deceleration).  

A stop light and a flat road cannot cause acceleration.  

Which term refers to the time interval between the passage of successive wave crests? a. wave height
b. wave period
c. wave speed
d. wavelength

Answers

I believe the correct answer from the choices listed above is option B. The term that refers to the time interval between the passage of successive wave crests would be wave period. It is the time for a particle on a medium to make one complete vibrational cycle. 
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PLEASE HELP ASAP!!!!!