Answer:
15000000 m
Explanation:
From the question,
Speed (S) = Distance(d)/Time(t)
S = d/t....................... Equation 1
Make d the subject of the equation
d = St..................... Equation 2
Given: S = 50 km/s = 50000 m/s, t = 5 minutes = 5*60 seconds = 300 seconds
Substitute these values into equation 2
d = 50000(300)
d = 15000000 m
Hence the skier travels 15000000 m
A 40.0 kg box is placed on a 2.00 m tall shelf. If the box falls off the shelf, what is its kinetic energy as it strikes the ground?
*Urgent*
(Part 1)
A merry-go-round rotates at the rate of 0.4 rev/s with an 99 kg man standing at a point 2.5 m from the axis of rotation. What is the new angular speed when the man walks to a point 1 m from the center? Consider the merry-go-round is a solid 73 kg cylinder of radius of 2.5 m. Answer in units of rad/s.
(Part 2)
What is the change in kinetic energy due to this movement? Answer in units of J.
Answer:
6.5 rad/s
11.695 kJ
Explanation:
Using the principle of conservation of momentum, we have
L1 = L2 and
I1w1 = I2w2, with I being the moment of inertia and w being the angular velocity.
w1 = 0.4 rev/s = 0.4 * 2π = 2.51 rad/s
Moment of Inertia, I = ½MR² + mr²
I1 = ½ * 73 * 2.5² +99 * 2.5²
I1 = 73 * 3.125 + 99 * 6.25
I1 = 228.125 + 618.75
I1 = 846.875 kgm²
The man has been said to have walked 1 m away from his position, so then
I2 = ½ * 73 * 2.5² + 99 * 1²
I2 = 228.125 + 99
I2 = 327.125 kgm²
From the formula stated above,
w2 = I1w1 / I2
w2 = (846.875 * 2.51) / 327.125
w2 = 2125.65725 / 327.125 rad/s
w2 = 6.5 rad/s
2
K = Iw²
K = 846.875 * 2.51²
K = 2125.65725 J
K'= Iw²
K' = 327.125 * 6.5²
K' = 13821.03125 J
Change in energy is given as, K' - K, so that
Energy, E = 13821.03125 - 2125.65725
Energy, E = 11.695 kJ
The location where an earthquake begins
A. Strike-Slip fault
B. Epicenter
C. Focus
D. Seismogram
Answer:
b
Explanation:
the location where an earthquake begin is called
Eiman connects eight 12Ω lamps in series. What is
the total resistance of the circuit?
Answer:
Total resistance = 96 Ohms
Explanation:
Given the following data;
Resistance = 12 Ohms
Number of resistors = 8
To find the total resistance;
Method I.
Since the resistors are connected in series, we would simply multiply the resistance by the number of resistors.
Total resistance = 12 * 8
Total resistance = 96 Ohms.
Method II.
We would add the resistance of all the eight resistors together.
Total resistance = 12 + 12 + 12 + 12 + 12 + 12 + 12 + 12
Total resistance = 96 Ohms.
The total resistance of the circuit will be "96 Ω".
Resistance and Current:Resistance: The amount of resistance to current flow throughout an electrical circuit.
Current: The movement of electrical charge carriers such as electrons has been referred to as current. The flow of current seems to be from negative (-) to positively (+) locations.
According to the question,
Resistance = 12 Ω
No. of resistor = 8
The total resistance be:
= [tex]Resistance\times Number \ of \ resistors[/tex]
By substituting the values,
= [tex]12\times 8[/tex]
= [tex]96 \ \Omega[/tex]
Thus the above answer is right.
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write down the expressions for the heat produced per second in a resistor in terms of current and resistance
Answer:
Heat,[tex]H=I^2 R[/tex]
Explanation:
Let H be the heat produced
Time, t=1 sec
I=Current
R=Resistance of resistor
We have to write down the expressions for the heat produced per second in a resistor in terms of current and resistance.
We know that
Heat, [tex]H=I^2 Rt[/tex]
Using the formula
Heat,[tex]H=I^2R\times 1[/tex]
Heat,[tex]H=I^2 R[/tex]
Hence, the the expressions for the heat produced per second in a resistor in terms of current and resistance is given by
Heat,[tex]H=I^2 R[/tex]
001)
9. A ball is rolled at a velocity of 12 m/s. After 36 seconds, it comes to a stop. What is the acceleration of the ball?
Answer:
0.33333333333
Explanation:
a = v/t
= 12/36
= 1/3
= 0.3333
Answer:
3
Explain
36/12
two homogeneous bodies of the same volume
Answer:
No, it is not necessary for them to have same mass.
Explanation:
Let both bodies have a density d1 and d2 respectively.
Since their volumes are equal V1 = V2
we know that, https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bvolume%7D
Hence, d1 = and d2 =
Taking the ratio of densities,we get
This implies that unless the bodies have same densities, the mass of the two bodies will not be same.
The acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force on the
ball. This example best illustrates what law?
A.Newton's first law of motion
B.Newton's second law of motion
C.Newton's third law of motion
D.Newton's law of universal gravitation
Answer:
B. Newton's second law of motion
Explanation:
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
[tex] Net \; Force = mass * acceleration [/tex]
Making acceleration the subject of formula, we have;
[tex] Acceleration = \frac {Net \; Force}{Mass} [/tex]
In this scenario, the acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force on the ball. Thus, this example best illustrates Newton's second law of motion.
What term is defined as speed with a specific direction?
velocity
position
distance
displacement
Answer:
Velocity
Explanation:
I took the test.
Which type of energy can be sensed by the eyes?
OA. electrical energy
B.
sound energy
OC. thermal energy
D. light energy
Answer:
light energy..
........
Answer:
light energy
Explanation: that is the only type of energy you can actually see.
What happens when an object becomes cold?
Energy is added to it.
Mass is removed from it.
Cold is added to it.
Heat is removed from it.
Answer:
Heat is removed from it.
Explanation:
A object will become cold when it loses its heat to its surroundings. I would look up the 3 Principles of Heat Transfer.
I hope this helped! :)
pennies used to be called coppers. how do you suppose they got this nickname?
Answer:
because pennies are made from copper
Explanation:
How does an air mattress protect a stunt person landing on the ground after a stunt?
Answer:
a) It reduces the kinetic energy loss of the stunt person.
An air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls.
What is air mattress?An air mattress is an inflated mattress composed of polyvinyl chloride (PVC) and textile-reinforced urethane plastic and rubber. It is also known as an airbed or even a blow-up bed. Deflated mattresses may be compressed and transported and stored in a tiny size.
An air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls or if it is thrown from a great height. This shields the stunt performer from catastrophic dangers like shattered bones or concussions.
Therefore, an air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls.
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Why is an electromagnet used instead of a permanent magnet in magnetic cranes?
Answer:
an electromagnet is a metal which has the ability to turn into a magnet on passing electricity through it .
But once the electric flow is withdrawn the circuit breaks and it no more behaves like a magnet.
but this is not so in permanent magnets
Explanation:
thus electromagnet is used in magnetic cranes bcoz their magnetism can be controlled conveniently.
Work out the current through a television with a power of 0.8 kW if it uses the 230 V mains supply. Give your answer to 1 decimal place.
Answer:
the current is 3.5 A
Explanation:
The computation of the current is shown below:
As we know that
Current [A] = Electrical power [W] ÷ Potential difference [V]
Now convert KW TO W = × 1000
So, the current is
= 800W ÷ 230V
= 3.5 A
Hence, the current is 3.5 A
Need help as fast as possible please
I will mark BRAINLIST only for correct answers babes :)
Thank you!
Explain why background radiation is a mixture of contamination and irradiation
Answer:
People are exposed to sources of radiation in all aspects of everyday life. Radioactive sources can be very useful but need handling carefully to ensure safety.
Explanation:
What is the blank? (physics)
The total energy of a system is equal to the energy added to the system plus the work and the ____ that is produced.
Answer:
Heat???
Sorry I am not at all sure
The brakes of a lorry are in a poor condition
What effect will the condition of the brakes have on thinking distance and the braking
distance of the lorry?
Answer:
friction
Explanation:
Her brakes will squeak and possibly slide or skid on concrete due to her brakes.
BUT it really depends on the condition of the wheels. Now it matters on the surface as well. Has the road been eroded? what has happened with her brakes? and what texture are the wheels? can seismic waves travel through them?
Answer:
thinking distance stays the same and the braking distance increases
AQA Approved.✅
Explanation:
How does the value and direction of the restoring force change as the spring constant or displacement is changed?
Answer:
The effect of gravity is only to shift the equilibrium point, so at equilibrium (at rest), a vertical spring will be extended as compared with the same spring in a horizontal position. But this does not affect the period.
As the spring constant or displacement is changed, the value and direction of the restoring force change, and they are always toward the equilibrium position of the spring when it is stretched.
What is the significance of the restoring force?When an object is relaxed or stretched, it is responsible for returning it to its original equilibrium position, such as a spring when stretched, and the force is directly proportional to the displacement and acts in the opposite direction of the displacement, the restoring force is responsible for the oscillations and waves, and its properties.
Hence, as the spring constant or displacement is changed, the value and direction of the restoring force change, and they are always toward the equilibrium position of the spring when it is stretched.
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How to calculate the refraction of light from air to water
Answer:
hope it would be helpful
Write two characteristics of an educated society
Answer:
Different and better?
Explanation:
i dont think that helps lol
An educated person has the ability to think clearly and independently and has good judgement.
What is Education?Education is defined as purposeful activity directed towards achieving some objective, such as the dissemination of knowledge or the promotion of skills and character traits, whose aims include the development of understanding, rationality, kindness and honesty.
There are three main types of education which are as follows:
Formal, Informal and Non-formal.
The specialty of education is that it is pre-determined and pre-planned. It is regular and spatial i.e. time bound and regulated by the institutional. Proper education improves people's understanding of the world around them which make them less susceptible to the influence of others
Thus, an educated person has the ability to think clearly and independently and has good judgement.
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value of x
Guys plz answer
and get marked as brainliest :)
Answer:
80⁰
Explanation:
triangle AOB = 180
So, a = 50
triangle CAB = a+a+x=180
CAB = 50+50+X=180
CAB = X = 180-100
X=80
HOPE IT HELPS
Answer:
Explanation:
Since OA = OB (Radius of a circle)
angle OAB = angle OBA = 50
I'm not sure what to do beyond this...
I hope this piece of information was helpful.
Why is it safer to collide with a soft cushion than a hard surface?
Answer:
Impulse is force multiplied by time; and together, the product must be 1 unit. A collision with soft ground will result in the 1 unit of impulse by a larger time and a smaller force (compared to the small time and a large force for the hard floor).
Are stairs a type of inclined plane?
Answer:
Inclined planes are simple machines used to make work easier. Ramps, ladders, and staircases are all inclined planes.
Explanation:
Answer:
imma say yes
Explanation:
If an object has a velocity of 15 m/s and a momentum of 30 kg m/s, what is its mass?
Answer:
30kgm/s/15m/s=2kg
Explanation:mass=momentum/velocity
The mass of the object is 2 kg.
What is momentum?The product of a particle's mass and velocity is its momentum. Momentum is a vector quantity, meaning it has both magnitude and direction. According to Isaac Newton's second equation of motion, the force acting on a particle equals the time rate of change of momentum.
Given that:
Velocity of the object: v = 15 m/s.
Momentum of the object: p = 30 kg m/s.
Let the mass of the object = m.
From the definition of momentum; we get:
momentum = mass × velocity
30 = 15 m
m = 2 kg.
Hence, mass of it is 2 kg.
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A 8-kg load stretches an elastic belt 0.02 m. How much will a 12-kg load stretch the belt?
Answer:
0.06
Explanation:
a 6 load will be 0.03 so double it to get the answer which is 0.06
an object that is accelerating may be
It must be either speeding up, or slowing down, or turning. There are no other possibilities.
2. a) A student obtained ice at 0°C from a refrigerator and placed it in a beaker on a
bench. After 4 minutes, the temperature rose to 4°C. State the changes that would be observed in the water in terms of;
(i) volume
(ii) mass
(iii) density
(b) Sketch a graph of density against temperature if the ice is warmed from 0°C to
8°C.
Answer:
2 4
Explanation:
because
Which vector is the sum of the vectors shown below?
