PHYSICS HIGH SCHOOL

Identify the examples of values. Check all that apply. Inez thinks it is important to be honest with her friends. Molly was raised in a foreign country. Byron tries to treat all people with respect. Lydia cares about expressing her creativity. Armando enjoys playing basketball. Marc would like to learn more about fashion.

Answers

Answer 1

Answer:

Answer:

Inez thinks it is important to be honest with her friends.

Byron tries to treat all people with respect.

Lydia cares about expressing her creativity.

Explanation:

Just did on Edge

Answer 2

Answer:

Answer:

1 3 4

Explanation:

Related Questions

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Einstein calculated that ripples of gravity travel at exactly the speed of _____
a car travels 15 kilometers west in 10 minutes. after reaching the destination, the car travels back to the starting point, again taking 5 minutes. what is the average velocity of the car?

At a constant pressure and a temperature of 280 K, the gas in a cylinder has a volume of 10.0 liters. If the volume of the gas is increased to 20.0 liters, what is the new temperature? 2800 K 28 K 140 K 560 K

Answers

560K I believe is the answer

.. An object has a mass of 40 000 kilogramsand a volume of 5 cubic metres. What is its
density?

Answers

Answer:

8000 kg/cm^3

Explanation:

The density formula is P = M/V

Density = P = ? expressed in kg/m^3

M = mass = 40,000 kg

V = volume = 5 m^3

P = 40,000/5

P = 8000 kg/m^3

During a phase change what happens to the temperature?

Answers

During a phase change the substance or objects temperature increases or decreases depending on which way they go, Solid to liquid to gas needs added heat which makes it an endothermic reaction. Gas to liquid to solid loses heat energy to slow down its particles this is an exothermic reaction.

The temperature either rises or falls during a state change.
Ex.
Melting from ice to water~ the temperature is rising.

OR

Ex.
From a gas to a liquid~ the temperature is falling.

A railroad track is being built on an inclined surface. What is the estimated height of the supporting pillar that will be erected at a horizontal distance of 200 meters from the start of the incline?

Answers

the estimated height of the supporting pillar is 20m, that will be erected at a horizontal distance of 200 meters from the start of the incline.

20m is the right answer on plato!!

You have a 2.00 kg block of lead. Lead melts at 327.5°C. Cpb = 130.0 J/kg*C and ?Hj for lead is 2.04x10^4 J/kg . Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

Answers

Answer:

$1.2\cdot 10^5 J$

Explanation:

1) First of all, we need to calculate the heat needed to raise the temperature of the block of lead from the initial temperature (25.0 C) to the melting temperature (327.5 C). This heat is given by the equation

$Q_1 = m C_(pb) \Delta T$

where

m = 2.00 kg is the mass of the block

Cpb = 130.0 J/kg*C is the specific heat capacity of lead

$\Delta T=327.5 C-25.0 C=302.5 C$ is the temperature difference

Substituting,

$Q_1 = (2.00 kg) (130 J/kgC) (302.5 C)=7.87\cdot 10^4 J$

2) Now we have to calculate the amount of heat needed to completely melt the lead, which is given by:

$Q_2 = m Hj$

where

Hj = 2.04x10^4 J/kg is the latent heat of fusion of lead

Substituting,

$Q_2 = (2.00 kg)(2.04\cdot 10^4 J/kg)=4.08\cdot 10^4 J$

3) Therefore, the total heat needed is

$Q=Q_1+Q_2=7.87\cdot 10^4 J+4.08\cdot 10^4 J=1.2 \cdot 10^5 J$

Answer:

Q = 2.00kg x 130 J/kgC x 302.5C

Q = 7.87 x 10^4j

Q = 2.00kg x 2.04 x 20^4

Q= 4.08 x 10^4

Q = 7.87 x 10^4j + 4.08 x 10^4 = 1.2 x 10^5j

Explanation:

5. Projectile A with mass m is launched at an angle of 20° above the horizontal with a speed v0. Projectile B also with mass m is launched from the same location at an angle of 70° above the horizontal, also with speed v0. Thus, both projectiles have the same initial total energy. a. Which projectile has a larger speed when it hits the ground or do they have the same speed? Explain using energy. b. Which projectile reaches a greater height? Given that both projectiles have the same initial energy, how is this possible?

Answers

Answer:

a) They both have the same final speed.

b) Projectile B reaches a greater height

Explanation:

The initial total energy of both projectiles is the same, and since the initial height is zero, that initial energy is entirely kinetic energy:

$E_0=K_0=(1)/(2)mv_0^(2)$

Now, when the projectiles are going to reach the ground, their height also becomes zero, so the final energy is also entirely kinetic energy:

$E_f=K_f=(1)/(2)mv_f^(2)$

As stated in the conservation of mechanical energy, the final total energy has to be equal to the initial total energy, and then:

$E_0=E_f\n \n (1)/(2)mv_0^(2)=(1)/(2)mv_f^(2)\n\n\implies v_0=v_f$

Finally, since the initial speed is the same for both projectiles, they have the same speed when they hit the ground (a).

Next, we know that the height reached by a projectile depends only of their initial vertical velocity, nor their horizontal one. So, the projectile with the highest initial vertical velocity has to reach a greater height. We use trigonometry to calculate that:

$v_0_A_y=v_0\sin20\°=0.34v_0\n\nv_0_B_y=v_0\sin70\°=0.93v_0$

It means that projectile B has a higher initial vertical velocity, so it reaches a greater height (b).

This is possible because some of the kinetic energy of both projectiles is never transformed to gravitational potential energy (because is related to the horizontal velocity) and this amount of kinetic energy depends on the angle at which the projectile is launched. As their potential energies at the highest points are different, their maximum heights are, too.

Other Questions

using kepler's 3rd law and newton's law of universal gravitation, find the period of revolution p of the planet as it moves around the sun. assume that the mass of the planet is much smaller than the mass of the sun.

earth were now in synchronous rotation with the moon? that is, suppose that earth rotated at the same rate that the moon orbits earth. what would be differ-ent about earth and life on it?

Leon sees a poster that shows a lake in front of a snow-capped mountain. The mountain appears upside down in the lake. Which best explains why the image of the mountain appears in the lake?A.The surface of the lake is smooth.B.The surface of the lake is transparent.C.The surface of the lake is polished.D.The surface of the lake is rough.

In a science museum, a 130 kg brass pendulum bob swings at the end of a 14.4 m -long wire. The pendulum is started at exactly 8:00 a.m. every morning by pulling it 1.7 m to the side and releasing it. Because of its compact shape and smooth surface, the pendulum's damping constant is only 0.010kg/s. You may want to review (Pages 405 - 407) . Part A At exactly 12:00 noon, how many oscillations will the pendulum have completed