PHYSICS HIGH SCHOOL

If a wave has a frequency of 2 Hz. what is the period

Answers

Answer 1
Answer: The period is the reciprocal of the frequency ... ' 1 ' divided by it.

 P = 1/f = 1 / (2 per second)  =  1/2 second

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Cliff divers at Acapulco jump into the sea from a cliff $30.7 m$ high. At the level of the sea, a rock sticks out a horizontal distance of $9.34 m$.The acceleration of gravity is $9.8 m / s ^{2}$. With what minimum horizontal velocity must the cliff divers leave the top of the cliff if they are to miss the rock? Answer in units of $m / s$.

What types of germs are found on hands

Answers

Everything that could have been on anything that you touched
since the last time you washed them are.
There are bacteria, viruses, fungi, and protozoa 

Which stars can be smaller than the Sun? Select all that apply.a. neutron stars
b. red giants
c. white dwarfs
d. main sequence stars

Answers

Answer:

a   and     d    are correct

Explanation:

a. neutron stars

d. main sequence stars

Are smaller than the sun but I'm not sure about white dwarfs because a typical white dwarf is about as massive as the Sun, yet only slightly bigger than the Earth.

What is meant by the following statement? "Inertia is directly proportional to mass." Inertia and mass are the same thing. Inertia and mass are the same size. Inertia increases as mass decreases. Inertia increases as mass increases.

Answers

Inertia increases as mass increases.

Explanation:

Inertia is the resistance of an object to any change in motion. Inertia is proportional the mass of the object: in fact, as we experience in common situations, the larger the mass of an object, the more difficult it is to change its motion.

A simple example: while it is quite easy to stop a tennis ball thrown towards us, we know that it is not so easy to stop a large truck travelling towards us with the same speed: the reason for that is that the truck has much more mass than the tennis ball, so it has much more inertia. Therefore, inertia increases as mass increases.
inertia increases as mass increases. In fact, mass is what causes inertia

Use newton's first law of motion to explain why you feel tossed around whenever a roller coaster goes over a hill or through a loop.

Answers

Newton's first law states that an object at rest will stay at rest && an object in motion will remain in motion unless acted on by another force. With that being said you feel tossed around because you are initially at rest but when you ride the roller coaster you take it's course of motion. 

Hoped this helped!

Explanation:

A roller coaster is hard to stop because it has a lot of inertia. Inertia can be simplified to, "objects want to keep doing what they are doing." It's when they are forced to do something different that they are doing that is why roller coaster riders experience the float or tossing around of the ride.

According to Levin, how can black holes be investigated?

Answers

By observing their effect on their surroundings.

Derive a relation between Universal Gravitational Constant (G) and Acceleration due to gravity(g)?

Answers

suppose earth is a soid sphere which will attract the body towards its centre.So, acc. to law of gravitation force on the body will be,
F=G*m1m2/R^2
but we now that F=ma
and here accleration(a)=accleration due to gravity(g),so
force applied by earth on will also be mg
replace above F in formula by mg and solve,
F=G*mE*m/R^2                             ( here mE is mass of earth and m is mass of body)
mg=G*mEm/R^2
so,
g =G*mE/R^2
suppose earth is a soid sphere which will attract the body towards its centre.So, acc. to law of gravitation force on the body will be,
F=G*m1m2/R^2
but we now that F=ma
and here accleration(a)=accleration due to gravity(g),so
force applied by earth on will also be mg
replace above F in formula by mg and solve,
F=G*mE*m/R^2                             ( here mE is mass of earth and m is mass of body)
mg=G*mEm/R^2
so,
g =G*mE/R^2
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