PHYSICS HIGH SCHOOL

In 3 seconds, a wave generator produces 15 pulses that spread over a distance of 45 centimeters. Calculate its velocity._____ cm/s

45

15

5.0

3.0

Answers

Answer 1
Answer: your answer is 45 because you would do 15*3 then that will get you 45
Answer 2
Answer:

Answer:

no its 15 you guys

Explanation:

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1. Can someone help me with this? :) Which object is made of frozen gas, ice, and dust that orbits in the outermost reaches of the solar system?1) planet
2) moon
3) Kuiper Belt object
4) meteor

2. Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?
1) A comet hit the sun and sent off fragments that became the planets.
2) The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets.
3) The planets formed at the center of a collapsing spinning cloud of gas and dust.
4) The sun and planets formed from a collapsing spinning cloud of gas and dust.

Answers

1. Kuiper Belt object is made of frozen is made of frozen gas, ice, and dust that orbits in the outermost reaches of the solar system. Kuiper belt is a region which is filled with icy gaz bodies. Its structure is almost the same as the asteroid belt between Mars and Jupiter. Pluto, Makemake, Haumea are the officially recognized planets which are located in this region. 2. In my opinion, the most suitable option is: 3) The planets formed at the center of a collapsing spinning cloud of gas and dust. According to theory of solar system formation, the solar system appeared after a supernova (star explosion). A cloud of gas and dust was collapsed, and it caused a formation of a solar nebula.

Answer:

1:  C. Kuiper Belt object

2:  D. The sun and planets formed from a collapsing spinning cloud of gas and dust.

Explanation:

I just took the test!!!

Why does the same side of the moon always face the earth?

Answers

Because the moon takes exactly precisely the same time to rotate once on its axis as it takes to revolve once in its orbit around the Earth.

What is word meaning "heated to a glow"?

Answers


I think the word you want is "incandescent".

Two objects are connected by a light string that passes over a frictionless pulley as shown in the figure below. Assume the incline is frictionless and take m1 = 2.00 kg, m2 = 7.35 kg, and θ = 50.0°.1) Find the magnitude of the accelerations of the objects. (m/s^2)
2)Find the tension in the string. (N)
3)Find the speed of each object 2.50 s after being released from rest. (m/s)

Answers

Answer:

Part a)

a = 3.81 m/s^2

Part b)

T = 27.2 N

Part c)

v_f = 9.53 m/s

Explanation:

For m2 mass along the inclined plane we can write

m_2g sin\theta - T = m_2 a

for m1 mass we can write equation in vertical direction

T - m_1 g = m_1 a

so we will have

m_2g sin\theta - m_1g = (m_1 + m_2) a

so we have

a = ((m_2 sin\theta - m_1)g)/(m_1 + m_2)

now plug in all data in it

a = ((7.35 sin50 - 2)9.81)/(7.35 + 2)

a = 3.81 m/s^2

Part b)

from above equation

T = m_1g + m_1 a

T = 2(9.81 + 3.81)

T = 27.2 N

Part c)

Speed of the object after t = 2.50 s

v_f = v_i + at

v_f = 0 + 3.81(2.50)

v_f = 9.53 m/s
assume m1 moving down, so m2 is moving up and accelleration direction of each box is the same as its movement.

check forces act on m1
1. tension of the rope T up
2. m1g down
3. moving down with a
f = ma --> m1g - T = m1a ...(1)
or. T = m1g - m1a ... (1.1)

check forces act on m2
1. tension of the rope T up alone the incline. it must be equal to previous one because it is the same segment of the rope.
2. m2gsine(θ) down along the incline
3. moving up with a
f = ma --> T - m2gsine(θ) = m2a ...(2)

replace T from (1.1) to (2)
(m1g - m1a) - m2gsin(θ) = m2a
m1g - m2gsin(θ) = m2a + m1a
a = g(m1 - m2sin(θ))/(m1 + m2)

plug in value you will get the answer. if a is negative, it means direction on our assumption is not correct. it's the opposite (direction).

after get a, you will get T
and velocity use v = u + at

... i cannot post pict. draw the diagram will make you understand this better.

Explain why a light wave refracts when it travels through mediums such as air to water.

Answers

The simplest explanation is that the speed changes. That causes the wavefront to change direction and so refraction takes place.

Heat is a transfer of thermal energy from one object to anther because of a difference in?

Answers

Because of a difference in temperature.

temperature is the answer
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