A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal. What must be true about force of static friction f on the block?A) f > mg
B) f = mgsin(?)
C) f > mgcos(?)
D) f = mgcos(?)
E) f > mgsin(?)
Answers
When the block is at rest, the static frictional force is equal to the horizontal component of the block's weight (F = mgsin(θ)).
The static frictionalforce on the body at rests is determined by applying Newton's second law of motion.
F = ma
where;
- F is applied force on a body
- m is the mass of the body
- a is the acceleration of the body
If the block is at rest, then the net horizontal force on the block is zero.
Thus, when the block is at rest, the static frictional force is equal to the horizontal component of the block's weight.
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Answer:
Option B
Explanation:
For a system of block on inclined ramp shown in the attached image. From the attached image, the Normal force N, weight mg and frictional force f act on the block. The sum of vertical forces should be zero just as sum of vertical forces should be zero when the system is in equilibrium condition.
Taking sum of forces along the inclined plane we deduce that
[tex]f=mgsin \theta[tex]
Therefore, option B is the correct option.
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c. cubic meter.
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Answers
Answer: The correct answer is option a.
Explanation:
Basic unit to measure mass is defined as the unit which is commonly used to measure the mass of an object.
From the given options,
Option a: Grams is a unit which is used to measure mass and it is the commonly used unit.
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Option d: Meter is the unit which is used to measure length.
From the above information, the correct answer is option a.
Answers
Velocity x time
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Hope this helps!
-namanraje777
260 m
35.8 m
848 m
Answers
Answer:
35.8 m
Explanation:
An appropriate formula is ...
The initial velocity is 0, and the acceleration due to gravity is 9.8 m/s², so the distance, d, is ...
Answers
Answer:
They collide, couple together, and roll away in the direction thatthe 2m/s car was rolling in.
Explanation:
We should start off with stating that the conservation of momentum is used here.
Momentum = mass * speed
Since, mass of both freight cars is the same, the speed determines which has more momentum.
Thus, the momentum of the 2 m/s freight car is twice that of the 1 m/s freight car.
The final speed is calculated as below:
mass * (velocity of first freight car) + mass * (velocity of second freight car) = (mass of both freight cars) * final velocity
(m * V1) + (m * V2) = (2m * V)
Let's substitute the velocities 1m/s for the first car, and - 2m/s for the second. (since the second is opposite in direction)
We get:
solving this we get:
V = - 0.5 m/s
Thus we can see that both cars will roll away in the direction that the 2 m/s car was going in. (because of the negative sign in the answer)
Answers
Mass-energy equivalence, as articulated in Einstein's E=mc² equation, indicates that mass can be converted to energy and vice versa. This theory has current practical applications such as the operations in nuclear power plants and in explaining natural phenomena like solar energy generation.
The principle describing mass-energy equivalence is most accurately presented by Albert Einstein's mass-energy equivalence equation, E = mc². In some processes, according to this equation from the theory of special relativity, mass can be converted into energy, and vice versa. This means that we consider mass to be a form of energy, not something distinct.
Examples of this conversion are seen in everyday life and nature. For instance, the sun's energy, the energy from nuclear decay, and even the heat in Earth's interior can be traced back to the mass-energy equivalence. Nuclear power plants and nuclear weapons provide practical examples of mass being converted into energy. In these cases, a tiny fraction of mass is annihilated to produce energy expressed as nuclear radiation.
Therefore, the theory of conservation of mass was supplanted by the more comprehensive theory of conservation of mass-energy which includes the phenomenon of mass-energy equivalence, and is described mathematically in the equation E= mc².
Learn more about Mass-Energy Equivalence here:
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Answer:
C. All energy in the universe is a result of mass being converted into energy.
Explanation:
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