A 2-inch, f/4 reflector has a focal length of:
6 inches
8 inches
4 inches
2 inches
Answers
Related Questions
What happens as a bungee jumper gets closer to Earth's surface?
A. Gravity decreases
B. His mass increases
C. Air resistance decreases
D. His velocity increases
Answers
Answer:
Velocity increases
Explanation:
Gravity is constant, except when discussing "apparent weight"
Mass is constant here
Air resistance would actually increase
Velocity DOES increase, because Earth is pulling the jumper downwards with an unbalanced force. The unbalanced force creates acceleration (-9.81 m/s^2), which means his velocity is increasing constantly.
HELPPPPPPP MEEEEEEE ASAP PLZZZZZZZZZ
Answers
Hey guys I really need help can you please come and help me on struggling please help I choose one but that could be wrong
Answers
Answer:
It's solar because if you leave a tv on for longer it gets hot and obviously it produces light and sound so, by subject of elimination, it's solar.
Explanation:
Answer:
I think solar because the thermal and sound and light are like a part of the tv (sorry for my English)
If anyone can answer any of these questions it would be so amazing. My teacher for physical science didn't do a good job explaining it and I don't have enough time to teach it to myself.
Answers
Answer:
H,ONCIC1N,ONHCOQ,OH2HOO2CO2NH2N2,OC,O2NO2 N,OThe box in the right diagram takes 1.1 sec to strike the floor after being released from rest. Find the landing speed of the 0.3-kg box, the tension of the rope, and moment of inertia of the pulley.
Answers
Answer:
dhrh4b
Explanation:
hours rbergrehebbeb3j3
What is the most accurate way to check your heart rate (bpm)? Help me?
Answers
Answer:
Count your pulse for 60 seconds.
Explanation:
This isn't physics, this quesiton should be marked in health.
Write S if the given quantity is scalar and V if the quantity is a vector
_100° Celsius
_50 m/s²
_300 s
_250 m/s, northwest
_1m, to the right
_10 cm,upwards
_525 600 mins.
_90 km/h,east
_5 000 kg
_1.5 L
Answers
Answer:
1. Scalar_100° Celsius
2. Vector_50 m/s²
3. Scalar_300 s
4. Vector_250 m/s, northwest
5. Vector_1m, to the right
6. Vector_10 cm, upwards
7. Scalar_525 600 mins.
8. Vector_90 km/h,east
8. Scalar_5 000 kg
10. Scalar_1.5 L
Explanation:
A scalar quantity can be defined as a quantity that has magnitude but no direction. Some examples of scalar quantities are speed, mass, temperature, volume, length, etc.
On the other hand, a vector quantity has both magnitude and direction. Some examples of vector quantities are acceleration, velocity, displacement, etc.
1. Scalar_100° Celsius (Temperature).
2. Vector_50 m/s² (Acceleration).
3. Scalar_300 s (Time).
4. Vector_250 m/s, northwest (Velocity).
5. Vector_1m, to the right (Displacement).
6. Vector_10 cm, upwards (Displacement).
7. Scalar_525 600 mins. (Time).
8. Vector_90 km/h,east (Velocity).
8. Scalar_5 000 kg (Mass).
10. Scalar_1.5 L (Volume).
Pls help it’s dues today
Sam studied kinetic and potential energy by observing apples on a tree during a field investigation. Explain what type of energy these apples have.
Answers
Answer: Gravitational Potential Energy
Explanation:
Calculating net force
Answers
Answer:
0N.
Explanation:
Net force is the sum total of forces acting on an object.
The Fn which is the net force is
450+ (-250) + (-600)+ 600+ 0 + 250 + (-450)
= 450-250+(-600)+ 600+0+250-450
= 0N
The net force is 0
Which of the following shows constant velocity?
Answers
Answer:cool
Explanation:
cool cool cool cool
What will happen when a charged object touches a neutral object?
Answers
if a charged object touches a neutral object it will be a short circuit.
Answer:
will force atom(electrons) within the escort (conductor) to go (move).
Explanation:
What must be your average speed in order to travel 350 km in 5.15 h? *
66.0 km/h
67.0 km/h
68.0 km/h
69.0 km/h
Answers
=
5.15/ 350
=68.0 km/h
Your personal hygiene is more important to avoid you becoming ill, more so than spreading germs.
True
False
Answers
a force of 25N acts on an object. The work done by the force is 400J. How far dose the object move in the direction of the force?
A. 6.3cm
B. 16cm
C. 16m
D. 10km
Answers
C
Explanation:
d=w/f
d=400/25
d= 16
The distance moved by the object in the direction of the force is equal to 16 m. Therefore, option (B) is correct.
What is the work?Work can be demonstrated as the energy employed when a force is exerted to move an object through a specific distance. The work done depends upon both the exerted force on the object and the displacement.
The action of the force when the object is moving in a straight line in the direction of the exerted force over a distance 'd'.
W= F ×d
Where 'd' is the displacement, 'F' is the applied force and W is the work done.
Given, the work done by the applied force, W = 400 J
The force applied on the object, F = 25 N
The distance moved by the object, d = W/F
d = 400/25
d = 16 m
Therefore, the object moves a distance of 16 m in the direction of the force.
Learn more about work, here:
brainly.com/question/13662169
#SPJ2
Use the scenario below for questions 4-7.
A rocket launched at a 60-degree angle has a launch velocity of
31.00 m/s.
4. What is the magnitude of the rocket's initial vertical velocity?
a. 10 m/s
b. 15.5 m/s
c. 26.85 m/s
d. 31 m/s
Answers
A larger car takes more force to move._
O Newton's 1st law
O Newton's 2nd law
O newton's 3rd law
O newton's 4th law
Answers
———
Newton's second law states that the acceleration of an object is directly related to the force on it, and inversely related to the mass of the object. You need more force to move or stop an object with a lot of mass (or inertia) than you need for an object with less mass. .
I’m a god, a planet, and I measure heat. What am I?
Answers
mercury??????? my only guess
Mercury is that it?
15. How mh energy does a 850W microwave transfer reheating a meal for 30s?
Answers
Answer: 25500 joules
Explanation: E = P x t
what determines the color of light?
1. wavelength
2. wave height
3. wave speed
4. wave amplitude
Answers
(Please Mark brainly or like I’m trying to get points lol!)
Answer:
wave length
Explanation:
What is the velocity of a 24 kg object with 108 kg m/s of momentum?
A) 3 m/s
B) 4.5 m/s
C) 6 m/s
D) 84 m/s
Answers
Answer:
The velocity of the object is 4.5 m/s
Explanation:
Momentum is equal to mass times velocity. We can rearrange that relationship to say that velocity is equal to momentum divided by mass. With that we can say:
v = 108 kg m/s / 24kg
v = (108 / 24) m/s
v = 4.5 m/s
All matter is made up of very small particles called. ?
Answers
Answer:
All matter is made up of very small particles called atoms.
briefly explain transport of oxygen by blood
Answers
Answer:
Once oxygen has entered the blood from the lungs, it is taken up by haemoglobin (Hb) in the red blood cells. ... Each molecule of haemoglobin can hold four oxygen molecules. It is haemoglobin that carries the oxygen as it is transported around the body in the blood.
Explanation:
A 780 kg vehicle accelerates at 4 m/s2. How much force is the car generating?
Answers
Explanation:
Given
mass (m) = 780 kg
acceleration (a) = 4 m/s²
Force (F) = ?
We know
F = m * a
= 780 * 4
= 3120 Newton
The car is generating 3120 Newton force.
Hope it helps :)
A rubber rod with a negative 4.0 C (-4.0 x 10-6 C) charge is 10 cm east of a pith ball with a positive charge of 5.0 C. A plastic rod with a positive 2.0 C charge is 5.0 cm north of the pith ball.
Answers
What is the momentum of a 750 kg car traveling at a velocity of 25 m/s north?
Answers
Answer:
18750 kg-m/s
Explanation:
Momentum = mass x velocity
Answer:
18750 kg-m/s
Explanation: Momentum = mass x velocity 750x25 = 18750 kg-m/s
Can you brainlist
what is reflection of light ? Which type of surface is required for a regular reflection
Answers
Answer:
MIRROR
Explanation:
Answer:
reflection of light is the bouncing back of light rats when it falls on a smooth surface or polish surface.
Solve for the gravitational potential energy at point B.
Use the steps below to show all your work for full points
Acceleration due to gravity =9.8 m/s/s
GPE = m*g*h
Answers
Answer:
GPEb=67.86% of initial GPE at point a
Explanation:
It depends on how massive the ball is, but I can still give an answer comparing original GPE at point A to new GPE at B
GPEa=m*9.8*140
GPEa=1372(m)
GPEb=m*9.8*95
GPEb=931(m)
GPEb=0.6786*GPEa
The temperature of one substance is 90 degrees F and another
substance is 50 degrees F. If they are placed close together, what will
happen
Answers
Answer:
Substance that is 90 degrees will lose energy and the substance that is 50 degrees will gain energy
Explanation:
because that is how energy work duhhhhh
Why is ultraviolet radiation considered more dangerous to humans than infrared radiation?
ANSWER:Ultraviolet radiation has a shorter wavelength than infrared radiation, and thus, the waves have higher energy. This allows them to penetrate the first layers of skin on humans and can mutate the DNA in the cells of the skin. This can result in cancer because of the mutations caused by the ultraviolet radiation.
Answers
hehe i hate being a single girl....what physical properties dose europium have
Answers
Answer:
Europium has a bright shiny surface. it's steel grey and has a melting point of 826 degree Celsius and a boiling point of about 1,489 degree Celsius.
Explanation:
the density is 5.24 grams per cubic centimeter.