PHYSICS HIGH SCHOOL

The more particles a substance has at a given temperature, the more thermal energy it has.

Answers

Answer 1
Answer: The statement 'The more particles a substance has at a given temperature, the more thermal energy it has' is true. The kinetic molecular theory of gases has three main laws and one of them is the average kinetic energy of the particles in a gas. The average kinetic energy of the gas particles is the behavior and movement it does in the surroundings. It is directly proportional to temperature wherein if you increase the temperature, the kinetic energy of a particle also increases. It will also decrease its movement or its kinetic energy if the temperature lowers. 

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Which of the following statements is an accurate description of vibrations? A. Neither ultrasonic nor infrasonic vibrations can be heard by humans.

B. The frequency of infrasonic vibrations is much too high to be heard by humans.

C. Ultrasonic vibrations have a frequency lower than the range for normal hearing.

D. Infrasonic vibrations are used in sonar equipment as well as to detect flaws in steel castings.

Answers

So we want to know what statement is an accurate description of vibrations. So humans can hear sound frequencies from 20-20000 Hz. Below 20 Hz is infra sound and above 20000 Hz is ultra sound. Humans cant hear both infra sound and ultra sound so the correct answer is A.

Infrasonic and ultrasonic vibrations can’t be heard by humans because they’re outside of the range of frequencies that can be detected. Infrasonic vibrations have a lower frequency than can be heard by the human ear; ultrasonic vibrations have a higher frequency than can be heard by the human ear. Infrasonic vibrations can be felt if the amplitude is great enough. Ultrasonic vibrations are utilized in sonar equipment and in applications to detect flaws in steel castings and to remove grease or foreign material from machine-part surfaces.

A 55kg female bungee jumper fastens one end of the cord (made of elastic material) to her ankle and the other end to a bridge. Then she jumps off the bridge. As the cord is stretching it exerts an elastic force directed up on her. Calculate her acceleration at the instant the chord exerts an elastic force of 825N [up] on her.

Answers

Downward force = gorce of gravity (her weight) = 55 x 9.8 = 539 newtons / / / Upward force = 825 newton. / / / Net force = 825 - 539 = 286 newtons upward. / / / F = m a / / / a = f / m = 286 / 55 = 5.2 meters per second squared Upward. / / / Note: We don't know the length of her fall before the bungee kicks in. At the moment we're dealing with, when her acceleration is 5.2 m/s-squared Upward, her velocity can very well be Downward.
When the jumper jumps off , there is always a force of gravity acting on her which is 55*9.8 =539N downwards. (Considering the acceleration due to gravity to be 9.8)
Since the question says that the force exerted by cord is 825N upwards , it is obvious that the pseudo force of acceleration must act downwards and the jumper must be moving upwards.
Assume the acceleration at that instant be 'a' .
Pseudo force  = mass *  acceleration = 55*a
Since the body is in dynamic equilibrium , all forces must cancel out.
Hence ,
539 +55*a = 825
=> 55*a = 825-539 = 286
=> a = 286/55 = 5.2
So , acceleration at that instant was 5.2 m/s²

By connecting two identical storage batteries together in series ("+" to "-" to "+" to "-"), and placing them in a circuit, the combination will yield:a. zero volts.
b. twice the voltage and the same current will flow through each.
c. the same voltage and different current will flow through each.
d. twice the voltage and different currents will flwo through each.

Answers

Answer: option B

Explanation: each cell is suppose to have an emf and an internal resistance.

Let E1 be the emf of the first battery and E2 be the emf of the second battery.

Et is the total emf.

Going by the connection described above, it is a series arrangement.

Hence the total emf is calculated as sum of individual emf

Et = E1 + E2

But each cell are identical, hence E1 = E2 = E

Et = E + E = 2E.

Hence the total voltage is twice the voltage.

Since the connection is a series arrangement, the current passing through each cell is the same.

These points have made option B the correct answer.

Answer:

b) Twice the voltage and the same current

Explanation:

The two batteries are identical, and are connected in series. When elements in a circuit are connected in series, the same current flow through them but the voltage drops are additive.

Since the two batteries are identical, the possess the same voltage of magnitude V.

Therefore, the total voltage, V_(total) = V + (V)\n

V_(total) = 2 V

An experiment measures the breaking point of identical strips of wood made from different trees. The procedure must contain which of the following instructions?

Answers

The procedure must contain : performing the experiment in a safe manner

Whatever your experiment maybe, the full steps to avoid any casualties and make the experiment as safe as possible should be included in the procedure/ instructions.

hope this helps

Answer:

the correct answer is a

Explanation:

performing the experiment in a

safe manner

A moving car has momentum. If it moves twice as fast what is it's momentum

Answers

as we know that P=mv .. where m is mass and v is velocity ..this relation shows that momentum has a direct relation with  these two quantities .. so when velocity is increased twice 
P' = mv 
P'=m2v
P' = 2 mv here mv is P so
P'=2P 
this shows that momentum will also be doubled by doubling the velocity :)

Near the surface of the earth what is the magnitude and direction of the acceleration due to gravity?

Answers


On the surface of the Earth, the acceleration due to gravity is 

                 9.8 meters/sec²  (rounded)

toward the center of the Earth.

Wherever we are, since that's the direction in which things fall when they're
dropped, we call the direction toward the center of the Earth by the name "down",
although it's a different direction in every place.
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