A 2-inch, f/4 reflector has a focal length of:
6 inches
8 inches
4 inches
2 inches
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Related Questions
Explain
8. How do you know that
the bicyclists in the first
panel above are moving
at a constant velocity?
Answers
Answer:
Constant velocity means that the object in motion is moving in a straight line at a constant speed. You know this as in the first panel each arrow representing each second is the same width apart, therefore you know the cyclists are moving at a constant velocity. Compare this to the second box representing changing speed. The arrows are different lengths meaning each second the cyclists are moving at a different speed and are not moving at a constant velocity.
Hope this helped.
How many significant figures does 1740200 have?
Answers
The asteroid has an estimated mass of 4000 kg and an orbital speed of 10 m/s. Determine the amount of kinetic energy of the asteroid. *
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Answer:
40,000J
Explanation:
Does distance play a role in the magnetic field ?
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what physical properties dose Neon have?
Answers
Answer:
Explanation:
It is a colorless, tasteless odorless inert gas.
It changes to reddish-orange color in vacuum tube.
It is chemically inactive.
It has the lowest liquid range of any element.
Why do we need to take care of the surface water/groundwater?
Answers
Answer:
sghskm
rohit zimheisbwhx
Which of these statements is true about the effect of a force exerted upon an object?
a. A large force always produces a large change in the object's momentum.
b. A small force always produces a large change in the object's momentum.
c. A small force applied over a long time interval can produce a large change in the object's momentum.
d. A large force produces a large change in the object's momentum only if the force is applied over a very short time interval.
Answers
Answer:
d. A large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
Explanation:
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
Also, the impulse of an object is given by the formula;
[tex] Impulse = force * time [/tex]
In accordance with the impulse-momentum theorem, the statement which is true about the effect of a force exerted upon an object is that a large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
ASAP! AWARDING BRAINLIEST see attached photo.
Answers
Answer:d
Explanation:
Answer:
I believe the answer would be B
i dont understand ..............
Answers
Take the upward and to-the-right directions to be positive (so down and to-the-left are negative).
The vertical forces acting on the object cancel, 6 N - 6 N = 0.
The horizontal forces exert a net force of 20 N - 3 N = 17 N. This net force is positive, so it points to the right. So the answer is A.
BI
Kinetic Energy of a Ball
at a Constant Mass
500
400
Kinetic Energy (m)
300
200
100
0
0 5 10 15 20 25
Speed (meters per second)
10 meters per second, which statement describes the change in kinetic energy of a ball of the same mass thrown
Compared to a ball thrown
at 20 meters per second?
halt (%) the kinetic energy of the ball thrown at 10 meters per
The kinetic energy of the ball thrown at 20 meters per second
second
The kinetic energy of the ball thrown at 20 meters per second is two times (2) the kinetic energy of the ball thrown at 10 meters per
second
The kinetic energy of the ball thrown at 20 meters per second is the same as () the kinetic energy of the ball thrown at 10 meters per
second
The kinetic energy of the ball thrown at 20 meters per second is four times (4) the kinetic energy of the ball thrown at 10 meters per
Second
10:18 AM
3/4/2021
4
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20 21 22
Next
Answers
Answer: A
Explanation:
The Escape speed at the surface of a certain planet is twice that of the earth. what is its mass in unit of earth's mass?
Plzz help
Answers
Answer:
22Km/sec
Explanation:
How does an increase in thermal energy affect the kinetic energy of the particles in each state of matter
Answers
Explanation:
when there is an increase in thermal energy, the kinetic energy if the matter increases as well.
Motion maps for two objects, Y and Z, are shown.
Y →
Z
x
How many seconds does Object Z start before Object Y?
2.
03
04
5
Answers
Answer:
i can't see the map plzz send the map
Answer:
its 3
Explanation:
I just took test
what physical properties dose plutonium
Answers
Answer:
Explanation:
Plutonium-239 is one of the two fissile materials used for the production of nuclear weapons and in some nuclear reactors as a source of energy. The other fissile material is uranium-235. Plutonium-239 is virtually nonexistent in nature. It is made by bombarding uranium-238 with neutrons in a nuclear reactor. Uranium-238 is present in quantity in most reactor fuel; hence plutonium-239 is continuously made in these reactors. Since plutonium-239 can itself be split by neutrons to release energy, plutonium-239 provides a portion of the energy generation in a nuclear reactor.
Please help, it’s the last question and I’m bad at Physics
Answers
Answer:
The end velocity of the sculpture is 7.00 m/s²
Explanation
The equation needed here is v = √(2gh). Let's do it:
v = √(2 × 9.8m/s² × 2.5m)
v = √(49.0 m²/s²)
v = 7.0m/s
Funny enough the numbers given don't have the accuracy demanded. We're given is 2.5m which is only accurate to the tenths, and 30kg which is only accurate to the nearest integer. Also, presumably the acceleration due to Earth gravity that's provided is only 9.8m/s², so that's still only the nearest tenth. So taking those and asking to find the answer to the nearest hundredth is pointless.
But whatever. The given answer is correct to the nearest hundredth. 7.00m/s² To be sure, I plugged it into a form on a physics page that does exactly that, and the answer they gave was 7.0023745972349, so we have it rounded correctly.
Joel uses a force of 50 Newtons to hold two weights 0.60 meters above his head. How much work is Joel doing on the weights?
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Marcus found that the weight of a rock on Earth is 22.5 newtons. He knows that the gravity on Saturn is 0.93 times the gravity on Earth. What would the weight of this rock be on Saturn?
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Answer:
The weight of the rock on Saturn would be 21.375
Explanation:
Since the weight on Saturn is 0.93 times the weight on Earth you would multiply 22.5 x0.93. This bring you too 21.375What is the total energy of a system with KE = 1368 J and a PE = 5782J? Express your answer in kJ.
Answers
Answer:
7.150 KJ
Explanation:
The total energy of a system is the sum of the potential and kinetic energy in the system. According to this question, the kinetic energy (KE) = 1368 J and a potential energy (PE) = 5782J.
Total energy of the system will be PE + KE as follows;
1368J + 5782J
= 7150J
However, the question demanded that the answer be in kJ (kilojoules), which is higher than the joules.
Since 1kJ = 1000J
7150J = 7150/1000
= 7.150kJ
DESPERATE WILL GIVE BRAINLIST AND THANKS
Which condition would have resulted from the functions of prokaryotes on early Earth?
Earth's oceans grew larger
less oxygen gas became present in the atmosphere
less carbon became present in Earth's soil
more oxygen gas became present in the atmosphere
Answers
the answer is B.
Answer: D. more oxygen gas became present in the atmosphere
Explanation:
I just took the test and that was the answer
how can understanding velocity help to prevent a mid-air collision
Answers
Answer:
To maintain enough time to prevent a collision, a system operating in air traffic where aircraft speed does not
fall below 100 km/h (most medium-sized UAVs and GA aircraft) will need to be able to detect obstacles which
subtend an arc-width of as small as 0.125 mra
A certain element has a half-life of 200 years. How much of a 1600 gram sample would be left after 800 years?
Answers
2222222×7÷4÷5+6(8×9)
Gizmo uniform circular motion
Answers
An object is moving to the right at a constant velocity. What will happen if a
force of 20 N starts acting on it in the opposite direction?
А The object's velocity will increase.
B
The object's velocity will decrease.
с
The object will come to a stop.
D
The object will move at the same velocity.
Answers
Determine the kinetic energy (in joules) of a 1000 kg roller coaster car that is moving with a speed of 25.0 m/s?
Answers
Explanation : using KE formula 1/2 m v^2 .
What can Magnetic force, electric force, and electrostatic force can all be described as.
Answers
Answer:
They can be described as non contact forces
A material that does not conduct heat very well
A
Expander
B
Radiation
C
Conductor
D
Insulator
Answers
Answer:
D
Explanation:
Insulator is like rubber, it cant physically hold heat well
Choose the correct words from the box to complete the definition of resistance.
current difficulty ease potential difference
The electrical resistance of a material is a measure of the ______________ of passing a ______________ through it.
Answers
Answer:
Opposition of passing a electric circuit
how are work and power shown when you are driving a car?
Answers
When driving a car, as you very well know, the engine is working, by enabling the car to move, and helping the tires roll. Power is used by enabling the car to turn on, the engine helps again.
Solids, liquids, and gases are very often depicted as groups of particles inside containers of fixed shape and dimension.
Using the simple model of solid, liquid, and gas, which of the following descriptions of physical properties is CORRECT?
A
The physical properties of this phase of matter are that the particles take the shape of the container, do not fill the entire volume, and are very strongly attracted to each other.
B
The physical properties of this phase of matter are that the particles take the shape of the container, do not fill the entire volume, and are strongly attracted to each other.
C
The physical properties of this phase of matter are that the particles take the shape of the container, they fill the entire volume of the container, and are strongly attracted to each other.
D
The physical properties of this phase of matter are that the particles do not take the shape of the container, they fill the entire volume, and are weakly attracted to each other.
Answers
Answer:
The answer would be B
Explanation:
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When a tight fitting lid is run under hot water, the lid _________ as the temperature increases. Question 3 options: Expands Melts Breaks Contracts
Answers
Answer:
expands
Explanation: