PHYSICS MIDDLE SCHOOL

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What is the name given to the change in state from liquid to solid?

Answers

Answer 1

Answer:

Answer:

The freezing point hope this helps

Explanation:

Answer 2

Answer: The change in state from liquid to solid is freezing

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1. You are driving south on the 405. You are in traffic so your speed is 35 miles per hour,(35 mi/hr). Calculate your speed in m/sec. Assume that there 1.609 meters in every mile.2. The Moon takes 27.25 days to make one revolution around the Earth. Calculate howmany seconds it takes for the Moon to make one revolution around the Earth.
What is the period of a wave generated by anearthquake, if it has a wavelength of 500 meters and aspeed of 5,000 meters per second?
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A newspaper turns yellow in sunlight. Is this a physical or chemical change?

Help. “What is the particles acceleration at t=3.0 s?”

Answers

Answer:

-2 m/s²

Explanation:

Acceleration is the rate of change of velocity:

a = Δv / Δt

In other words, it's the slope of the line on a velocity-time graph. The line at t=3 also goes through the points (2, 4) and (4, 0).

a = (4 m/s − 0 m/s) / (2 s − 4 s)

a = -2 m/s²

Atoms from which two elements would form ionic bonds

Answers

Answer:

Explanation:

Ionic bonds are formed by transfer of electrons between metal and non metals. Electronic configuration of calcium: Calcium atom will lose two electron to gain noble gas configuration and form calcium cation with +2 charge.

hope this helps

Common units of measurement for speed.

Answers

miles per hour (mph or miles/h), kilometers per hour (km/h), or meters per second (m/s).

Miles, kilometers, meters

HELP!!!!!! PLEASE!! I WILL GIVE 25 POINTS!!!!1) Joe and Ben were arguing about the Law of Conservation of Energy. Joe said that the Law of Conservation of Energy must be false because when you turn on a light it uses energy and so some of the energy is lost. Ben disagrees and says that energy cannot be created or destroyed. Who is right? Justify your answer.

A) Joe is right because the electricity is changed to heat and light and is no longer electricity.
B)Ben is right because the Law of Conservation of Energy is a law and cannot be false.
C) Ben is right because the electricity from the light is transformed into heat and light.
D) Joe is right because all electrical lights and appliances use electricity.

2) Greg and Shawn are studying for a physical science test. Greg thinks that the kinetic energy of an object depends on the height and speed of an object, but Shawn thinks it depends on the mass of an object. Who is right and why?

A) Shawn is right. The mass of an object determines the inertia of the object. Increasing inertia is the only thing that will increase kinetic energy..
B) Both Greg and Shawn are correct since kinetic energy depends on mass, height and speed of an object.
C) Greg is right. Increasing the height or speed of an object increases the kinetic energy of an object.
D) Neither is completely right. Shawn is partly correct since kinetic energy depends on mass, but Greg is also partly right since it also depends on speed.

3) Dan got into his car in the middle of summer. When he sat on the hot black leather seats, he burned his legs. His sister said that conduction was the reason Dan burned his legs, but Dan blamed the sunshine and said it was radiation that caused him to get burned. Who was right and why?

A) Both Dan and his sister are right. The sun heated the car seats through radiation heat transfer, but then Dan touched the seat and the heat was conducted to his legs.
B) Dan's sister was correct because Dan's legs touched the car seats. That is an indicator of heat transfer by conduction.
C) Dan was right because the sun heated the car without touching it. That is radiation.
D) Dan's sister was right because conduction can transfer heat through both solids and fluids (such as air).

Answers

1) C) Ben is right because the electricity from the light is transformed into heat and light.

Explanation:

The Law of Conservation of Energy states that energy cannot be created nor destroyed, but only transformed.

In this particular example, energy is not destroyed. In fact, the electrical energy (produced, for instance, by the battery inside the torchlight) is converted into light (electromagnetic wave) and heat (thermal energy). So, Ben is right, because energy is just transformed into other types of energy.

2) D) Neither is completely right. Shawn is partly correct since kinetic energy depends on mass, but Greg is also partly right since it also depends on speed.

Explanation:

The kinetic energy of an object is given by:

$K=(1)/(2)mv^2$

where m is the mass of the object and v its speed. From the formula, we see that neither Shawn nor Greg is completely right, because the kinetic energy depends both on the mass and the speed, and:

- Greg only told about the speed

- Shawn only told about the mass

3) B) Dan's sister was correct because Dan's legs touched the car seats. That is an indicator of heat transfer by conduction.

Explanation:

Conduction is the method of heat transfer that occurs between two solid objects, when they are in contact with each other, and it is due to the collisions between the molecules of the two objects: when colliding, the molecules of the hotter object transfer part of their kinetic energy to the molecules of the colder object.

In this case, Dan legs are in contact with the car seat (which is at higher temperature), so heat is transferred from the seat to Dan legs by conduction.

3 is B my dude and the reason nobody answered is because thousands of questions are asked every day. So not every question can be answered. It doesn't have to do with being lazy.

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