A bird flying towards its nest has a mass of 0.25kg and a kinetic energy of 40.5J. What is the speed of the bird?
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Choose the correct answer for the following sentences and give the
reason for your answer.(10 marks)
(i) The product of power into focal length for a lens is equal to
(ii)
(a) One (b) ten
(c) one hundred
The human eye has a lens of focal length +5 cm. The power of the
eye is
(a) 0.05 D
(b) 5 D
(c) 20 D
A transparent rod in which successive total internal reflection can
occur is called
(a) A light pipe (b) a thin prism (c) total internal
reflection
The wavelength of visible light is between
(a) 400 nm to 700 nm (b) 40 km and 70 km (c) 20 mm to 200
(iv)
mm
(v)
The SI unit for wave intensity is
(a) Js
(b) Wm?
-1
(c) Wmk1
Answer:
Explanation:
What factors affect the amount of potential energy an object has?
Answer:
The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in.
Explanation:
The factors that affect the amount of potential energy an object has are its mass, gravity, and height. This is further explained below.
What is potential energy?Generally, potential energy is simply defined as the energy held by a body as a result of its location with relation to others, internal tensions, electric charge, and other elements
In conclusion, The potential energy of a body is given by P.E=mgh
Read more about Energy
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What is the force on an object of mass 55 kg that is accelerating at 24 m/s2
Answer:
1320 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 55 × 24
We have the final answer as
1320 NHope this helps you
A 20N bucket is accelerated upward out of a well, by a rope with a force of 75N. What is the acceleration of the bucket
Answer:
36.76m/s²Explanation:
Given
Weight of the bucket = 20N
Mass = Weight/acceleration due to gravity
Mass = 20/9.8
Mass = 2.04kg
Applied force = 75N
Get the acceleration
According to Newton's second law:
F = ma
a = F/m
a = 75/2.04
a = 36.76m/s²
Hence the acceleration of the bucket is 36.76m/s²
You shove a chair with wheels(and let it go)and it starts moving across the floor. However,the chair soon shows down and comes to a complete stop. To keep the chair moving,you need to keep pushing on it.
This simple experiment implies that ;
A) Newton's first law,or the law of inertia,does not apply to a chair moving horizontally
B) The action-reaction forces act on the chair and cancel each other
C) A net force in the direction opposite to the motion of the chair acts to slow it down
D) The weight of the chair slows it down
Answer:
Personally I think, that the answer is B.
Explanation:
How do fossils provide evidence of continental drift?
A. Similar fossils are found all over the world.
B. The same fossils were found on land and under the ocean.
C. The same fossils were found on different continents.
D. The fossils show a record of climate change.
Food that is cooked properly can no longer be contained. True or false
Answer:
true they can no longer be contained
newton's first law equations like velocity and stuff like that
Answer:
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force. ... An object sliding across a table or floor slows down due to the net force of friction acting on the object.
Explanation:
please give me a heart
An athlete completes one round of circular track of diameter 200 meter in 40 sec. What will be the distance covered and the displacement at the end of 2 meter 20 seconds ?
Answer:
400m
Explanation:
If An athlete completes one round of circular track of diameter 200 meter in 40 sec, we can write;
200m = 40sec
To determine the distance after 2min 20secs, we can write;
x = 2,min 20sec
x = 80sec
Divide both expression
200/x = 40/80
200/x = 1/2
x = 2×200
x = 400m
Hence the distance covered after 2min 20secs is 400m
8. What is the S.l unit for mass?
A. kg
B. m/s2
D.N
C. m/s
Answer:
the answer is kg
Explanation:
because the s.i unit for mass is kilogram
which statement best describes a chemical reaction?
Answer:
a chemical reaction is a reaction that happens between two objects, like fire and a potion in chemistry
Explanation:
the reason is that the the fire causes the chemical to react, making a chemical reaction
3
The ion of an element has 3 positive charges. Mass Number of
I Neutrons is ly. What is the of electrons in the song.
Answer:
3 electron hai bro of puch mujhe sab aata h
find momentum, when mass = 20kg and velocity = 5 m/ sec ?
Answer:
the momentum is 100 bas p=mv
The statement “Heavy objects fall faster than light objects” is an example of a(n) _______.
A. Hypothesis
B. Question
C. Conclusion
D. Theory
Answer:theory
Explanation:
A force off 700 newtons is applied to a 600 kg bowling ball. What is the acceleration of the bowling ball once the force is applied?
Answer:
1.17 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{700}{600} = \frac{7}{6} \\ = 1.1666666...[/tex]
We have the final answer as
1.17 m/s²Hope this helps you
WILL MARK BRAINLIEST
TRUE or FALSE?If you are an astronaut slowly drifting away from the space station, you might be able to drift back to the station by throwing a 5-kg tool rapidly in the direction that you are traveling (away from the station).
Answer:
yes every action as an equal and and opposite reaction. if you throw a tool then it will give you a reaction and you will move back.
Explanation:
According to Newton's third law of motion, when two bodies interact between them, appear equal forces and opposite senses in each of them.
To understand it better:
Each time a body or object exerts a force on a second body or object, it (the second body) will exert a force of equal magnitude but in the opposite direction on the first.
So, if you as an astronaut in the described situation throw your tool in the direction that you are traveling (in the opposite direction of the space station), according to Newton's third law, you will be automatically moving towards the station
The more conductive an object is, the easier it is for neutrons to go through the object.
True
False
Answer:
false bcz neutrons do not move they r fixed in nucleus so it will. Fallse
A compact car moving at 60 m/s has 320,000 J of kinetic energy. What is its mass?
Answer:
320,000J
Explanation:
mass=320,000J
if F = -F represents Newton's third law, then "-F" represents the ________
a. opposite
b. leading
Answer:
opposite .
Explanation:
Answer: The answer is a) opposite
Explanation: I just completed the USA Test Prep and got a 100! :))
A gas has a pressure of 150 kPa at a volume of 6 m3. Calculate the volume of the same mass of gas at a pressure of 425 kPa
Answer:
V2 = 2.12 m³
Explanation:
Given the following data;
Original pressure, P1 = 150 kPa
New pressure, P2 = 425 kPa
Original volume, V1 = 6 m³
To find the new volume V2, we would use Boyles' law.
Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.
Mathematically, Boyles law is given by;
[tex] PV = K[/tex]
[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]
Substituting into the equation, we have;
[tex] 150 * 6 = 425V_{2} [/tex]
[tex] 900 = 425V_{2} [/tex]
[tex] 900 = 425V_{2} [/tex]
[tex] V_{2} = \frac {900}{425}[/tex]
[tex] V_{2} = 2.12[/tex]
Therefore, the new volume of the mass of gas is 2.12 cubic metre.
The temperature at which air becomes saturated with water vapor is called the
percent saturation
water content
dew point
relative humidity
thanks in advance
Answer:
C) Dew Point
Explanation:
The dew point is the temperature at which air is saturated with water vapor, which is the gaseous state of water. When air has reached the dew-point temperature at a particular pressure, the water vapor in the air is in equilibrium with liquid water.
dew point
Explanation: mark me as brainlest
Define the difference between an independent variable (test variable) and a dependent variable (outcome variable) in a scientific experiment.
Answer:
Independent- isn't effected by the other variables and is changeable
dependent- is the outcome of the expirment and depends on the other variables
Answer:
a factor that changes due to the independent variable
Explanation:
WILL MARK BRAINLIEST!
TRUE or FALSE? When a large truck pushes a small car with a given force, the small car is applying an equal and opposite force on the truck.
Answer:
True
Explanation:
Newton's first law of motion states that an object at rest will stay at rest unless acted upon by an outside force.
Answer:
When a large truck pushes a small car with a given force, the small car is applying an equal and opposite force on the truck. Newton's first law of motion states that an object at rest will stay at rest unless acted upon by an outside force.
Explanation:
so its true
A boy of mass 60kg jumps off a truck of mass 140kg travelling at 7.7m/s. If the boy runs towards the truck with a velocity of 2.5m/s, calculate
(a) the momentum of the truck before the boy jump off
(b) The momentum of the boy on jumping off the truck
(C)the loss of kinetic energy the moment the boy jumped off.
Answer:
hanbebdgsgzjbzbsijxbzyuxhzhbz
Explanation:
auhsbsbgsyuahsiixhwgs6
A wave has a frequency of 900 Hz and a wavelength of 200 m. At what speed is this wave traveling?
Answer:
The velocity of the wave is, v = 180,000 m/s
Explanation:
Given data,
The frequency of the wave, f = 900 Hz
The wavelength of the wave, λ = 200 m
The formula for the speed of the wave when the frequency and wavelength are known,
v = λ x f
Substituting the given values in the above equation,
v = 200 m x 900 Hz
v = 180000 m/s
Hence, the velocity of the wave is, v = 180,000 m/s
The interval shown here represents a _____.
strong base
weak base
weak acid
strong acid
Answer:
Strong acid
Explanation:
.... ..............
is drinking water a fat, carbohydrate, protein, mineral, vitamin, or water
Explanation:
drinking water is water... but it is also good for you to drink water...
A force of 600N is used to slide a sled across a floor 20 meters . The rope pulling the sled is held at 35 * . How much work does the force do?
Answer:
9830 J
Explanation:
(Just a tip, you should use the degree symbol ° instead of *)
That being said we know W = F*d*cos(θ). In this case θ = 35°.
W = F*d*cos(θ) = 600*20*cos(35)
= 12000*cos(35)
= 9829.925 Joules
Solution: Work ≈ 9830 J
What is the acceleration of a 7 kg mass if the force of 70 N is used to move it toward the Earth?
Answer:
10 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
m is the mass
f is the force
From the question we have
[tex]a = \frac{70}{7} = 10 \\ [/tex]
We have the final answer as
10 m/s²Hope this helps you