PHYSICS MIDDLE SCHOOL

Which object moves in simple harmonic motion?\a stretched rubber band with an mass
b rolling ball going down a hill
c moving car
d orbiting satellite

Answers

Answer 1
Answer:

Answer:Stretched rubber band with an mass

Explanation:

Simple harmonic motion requires a restoring force.

Simple harmonic motion should be periodic.

Option A:

When a rubber band is stretched,the internal forces of the rubber band pulls the band inside.So,internal forces are the restoring forces in a rubber band.

The motion is periodic as well since the the rubber band makes to an fro motion expanding ans contracting.

So,this performs SHM.

Option B:

There is no restoring force and no periodicity.

So,this is not SHM.

Option C:

There is no restoring force and no periodicity.

So,this is not SHM.

Option D:

There is periodicity but no restoring force.

So,this is not SHM.

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The boiling point of the crystalline mass is 50° Celsius
200° Celsius
300° Celsius
400° Celsius

Answers

Boiling point is at 200° Celsius

Explanation:

Matter exists in three states:

- Solid state: the molecules of the element are fixed in their place and strongly bonded to each other - therefore, they can only vibrate around their fixed position.

- Liquid state: the molecules of the element are free to slide past each other - however, there are still intermolecular forces that keep them close to each other

Gas state: the molecules of the element are completely free to move far from each other

Evaporation is the process that occurs when a substance changes from liquid to gas state. This process occurs when the temperature of the substance reaches its boiling point.

In the graph given in this problem (find it in attachment), we observe that:

- At first, the temperature increases up to 50 Celsius; this is the solid state

- Then the temperature stops increasing --> this is the transition of phase from solid to liquid (melting), which occurs at a constant temperature of 50 Celsius (melting point)

- Then, the temperature increases again up to 200 Celsius (liquid state)

- Then the temperature stops increasing again --> this is the transition of phase from liquid to gas (evaporation), which occurs at a constant temperature of 200 Celsius, which is therefore the boiling point

- Then, the temperature increases again (gas state)

Therefore, the boiling point of the substance in this problem is

200° Celsius

Learn more about temperature:

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Answer:

B

Explanation:

200 degrees Celcius.

HELP ASAP PLEASE PHYSICS 1.How much charge is carried across a 5.5 A current over a time of 8.3 seconds? (1 point)
45.65 C
52.79 C
78.11 C
20.05 C


2.A current of 1.90 A flows through a wire. How many electrons pass through that wire in 1 second? The charge of an electron is 1.602 x 10^-19 C (1 point)
2.32 x 10^19 electrons
2.01 x 10^18 electrons
1.04 x 10^20 electrons
1.19 x 10^19 electrons


3.A battery of voltage 9.0 V produces a current of 17.5 mA across a circuit. What is the resistance of the circuit? (1 point)
433 Ohms
514 Ohms
701 Ohms
384 Ohms


4.A battery is marked as having a voltage of 12.0 V and is connected to a circuit that has a resistance of 5.0 Ohms. If the terminal voltage is 8.75 V, what is the internal resistance of the circuit? (1 point)
1.02 Ohms
1.86 Ohms
2.45 Ohms
1.36 Ohms


5.A 12.0 V battery is attached to a circuit with a resistor of 5.5 Ohms. The internal resistance of the circuit is 1.75 Ohms. What is the terminal voltage of the circuit? (1 point)
9.01 V
12.8 V
7.67 V
10.3 V


6.A resistor has a potential difference of 16.5 V across it. It develops thermal energy at 340 W. What is the current across the resistor? (1 point)
15.5 A
23.9 A
31.1 A
20.6 A


7.A 120 V potential difference goes through a light bulb. The wattage of the bulb is 70 W. What is the resistance of the bulb? (1 point)
206 Ohms
114 Ohms
378 Ohms
256 Ohms


8.What is the equivalent resistance in this circuit? (1 point)

26 Ohms
13 Ohms
32 Ohms
18 Ohms


9.What is the equivalent resistance in this circuit? (1 point)

2 Ohms
5 Ohms
1.25 Ohms
3 Ohms


10.A tightly coiled spring has 70 coils, each coil has a diameter of 2.5 cm. The coil is made of conducting cylindrical wire that has a diameter of 3.0 mm. If an ohmmeter records the resistance across this wire as 2.70 Ohms, what is the resistivity of the wire? (1 point)
0.120
0.036
0.089
0.051

Answers

Answer:

1. 45.65

2. 1.19x10^19

3. 514OHM

4. 2.45 ( NOT 1.86 OR 1.36)

6. 20.06A

7. 206 ohms

8. 13 Ohms

9. 2 ohms

10. 0.051 ( NOT 0.036 OR  0.089)

Explanation:

I've struggled with both problems 4 and 10

Answer: did you get the answers?

Explanation:

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air resistance
fluid friction
sliding friction

Answers

1. It will stay at rest due to inertia. 2. acceleration 3. The couch will move to the left with a force of 1 N. 5. 6 N 6. Friction pulls the skates' wheels westward. 7. velocity 8. its speed increases due to gravity 10. It will have a constant velocity until acted upon by outside forces. 11. 35 N 12. mass 13. sliding friction 14. The couch will move with a force of 6 N. 15. It is pushing up on the book. 16. gravity 18. There is less friction between the car tires and the ice than between the car tires and the road. 20. balanced. 21. Due to centripetal force, the water is pushing on the bottom of the bucket. 22. a high velocity and a large mass 23. Scientists in other countries use SI units when measuring speed

How does Newton's law work? Give an example of the formula in a word problem.

Answers

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Which explains how winds move?

Answers

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Crusades
Middle Ages
Industrial Age

Answers

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