Answer:
I'm fairly certain it's 1,800
Explanation:
The efficiency of the wedge with force F=900 N displaces the wedge 0.10 m is 55.55% or 56%.
What is the efficiency of the machine?The efficiency of the machine equals the ratio of output energy and input energy. It is also defined as the ratio of work done on a load by the machine to the work done on the effort by the machine.
A load is defined as the weight lifted by the machine. The effort is defined as the force applied to bring the desired change in the load. Work done is defined as the product of force and displacement.
The efficiency, η = Output power / Input power, and the highest efficiency of the machine is equal to one. The efficiency of the machine has no unit. The efficiency η = (Actual work done / Ideal work done) × 100.
From the given,
Force = 900 N
Displacement = 0.1 m
Work done = F × s = 900×0.1 = 90 J
Actual work done = 50 J
Efficiency,η = (50/90) × 100
η = 55.55 %
Thus, the efficiency of the wedge is 55.56%.
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Mr. White drops a bowling ball and a feather from the top of the Washington Monument.
a) Which will hit the ground first? Why?
b) If Mr. White were to repeat this experiment inside a vacuum chamber, which would hit the ground first? Why?
If you can provide some explanation I would greatly appreciate it! :)
Answer:
A) The bowling ball will hit the ground first. It is heavier, which has greater density, allowing it to reach the ground first.
B) Feather. If you want to be able to blow a bowling ball in a vaccum cleaner, it's almost impossible since it's very heavy. If it's a feather, it would be easier as it's light and the air inside it is able to force it down.
Note: I haven't learnt physics at all yet, this is just an attempt. I'm in 7th grade currently and I will probably be taking physics sometime in 9th grade.
A student wants to test the force of magnetism by placing objects on top of a piece of cardboard and then moving them with a magnet placed under the cardboard. Which items will help the student with this investigation?
Answer:
Any material that has ferromagnetic property
Explanation:
Materials such as iron, nickel or cobalt are ferromagnetic element as they behave as small magnets in the presence of moving electric charge or static magnetic field.
When an external magnetic field is applied these ferromagnetic material align in a way that they contribute to produce a stronger magnetic field in the material and remain aligned even after removal of the external magnetic field.
9. If the frequency of a certain light is 3.8 x 1024 Hz, what is the energy of this light?
Answer:
E=hf
Were, h = Planck constant 6.67*10^11
E=3.8*10^24 * 6.67*10^11= 2.508*q0^36j
Heat is an exchange of internal energy from one system to another due to
OA.
one system being liquid and the other being solid.
OB.
the systems having the same temperature.
OC.
one system being gas and the other being solid.
OD
a temperature difference between the systems.
Answer:
OD
Explanation:
2 bodies should have different temperatures for energy to be transferred
Which of the following best demonstrates Newton's Third Law?
Question 3 options:
The harder you kick a soccer ball, the faster it accelerates
An object sitting on the ground will stay there until somebody or something pushes it
Wearing a seatbelt prevents you from continuing to move when the car has stopped
When you walk your foot pushes down on the ground while the ground pushes back on your foot
Answer:
when you walk your foot pushes down on the ground, while the ground pushes back on your foot
Explanation:
it was another brainly question, Goodluck :)
How might electric fields be involved in a levitation device?
Answer:
When a magnet is moving relative to a conductor in close proximity, a current is induced within the conductor. This induced current will cause an opposing magnetic field. This opposing magnetic field can be used to levitate a magnet.
Explanation:
Weightlessness occurs when an object applies a reaction force to another object. Please select the best answer from the choices provided T F
Answer: The answer is F
Explanation: because it is I took the test
A motorist is driving at a constant velocity of 28.0 m/s when he decides to pass a car is in front of him. He accelerates at a rate 2.50 m/s2 for 3.00 seconds while passing the car. What is his velocity at the end of the 3.00 seconds?
Answer:
Final velocity, V = 35.5m/s
Explanation:
Given the following data;
Initial velocity = 28m/s
Acceleration = 2.5m/s²
Time = 3 seconds
To find the final velocity, we would use the first equation of motion
V = U + at
Where;
V is the final velocity measured in m/s.
U is the initial velocity measured in m/s.
a is the acceleration measured in m/s².
t is the time measured in seconds.
Substituting into the equation, we have;
V = 28 + 2.5*3
V = 28 + 7.5
Final velocity, V = 35.5m/s
Which of the following correctly represents an element?
A Water - H20
B Copper - Cu
C Carbon monoxide - CO
D Salt - NaCl
Answer:
A water H2O
Explanation:
H2O is composed of 2 hydrogens which is represented H2 and the hydrogen is combined with one oxygen which forms water which is H2O
Which of the following is the best thermal conductor?
A. Gasoline
B. Silver
C. Plastic
D. Helium
Answer:
The answer is B. Silver
Explanation:
I took AP3X quiz.
Two forces are going in opposite directions each force is 9.
The net force and the direction is?
Answer:
The net force is zero.
Explanation:
Two opposing and equal forces cancel each other out, giving you a net force of zero.
Whoever could answer this I would make Brainliest
Answer:
1. the rocks at the bottom of the aquarium
2.the fish and maybe the plants (if you use live plants)
3. fish interact with there no living things like how one would hide in the grass or something like that.
4. decorations (like a cave or fake house, tho the aquarium its self is a home)
5.they would die, and rot.
Explanation:
rocks are nonliving
fish are living things and so are plants
fish can hide in the plants
the fish can "live" in the decorations, but the aquarium itself is its home.
if something reaches the end of its life span it dies.
Urgent! Which is not an example of work? Question 2 options: pushing a box across the floor picking up a box off the floor raising a barbell over your head trying to push a rock that never moves
Answer:
trying to push a rock that never moves
Explanation:
Example of kinetic to potential ? And how the energy is changing forms???? Please help
Answer:
A ball when from moving to stoping
Explanation:
Kinetic = energy of motion
Potential = energy stored
When you roll a ball on the ground, it gains kinetic energy, but then the ball starts to slow down until it stops and it remains at rest which means it's at potential energy. It went from moving (kinetic) to stoping (potential)
Hope this helped!
Have a supercalifragilisticexpialidocious day!
Hi, I have a question if I calculate the average force that must be exerted on a 0.145 kg baseball for me to give it an acceleration of 130 m/s2. How would I get I get the acceleration would I divide 130 by 0.145 kg to get the acceleration?
HELP + extra pts // Two 10-m high diving platforms are at opposing ends of a 30-m pool. How fast must two clowns run straight off their boards if they want to collide at the middle of the pool and the surface of the water?
Explanation:
The clowns need to leave the diving boards with enough horizontal velocity such that each travels 15 m (half the width of the pool) in the same time that they fall (vertically) the 10-m from the top of the diving board.
We'll assume no force acts on the clowns horizontally to slow them down while they are in flight. And we'll assume that only gravity acts on the clowns vertically.
We can treat the horizontal and vertical components separately. This will help simplify the problem.
Let's start with the vertical displacement. Let's say the clown is dropped from a height of 10-m. How long would it take them to fall that distance?
Using our equations of motion (with constant, linear acceleration), we can solve for this time. [tex]d = vt + \frac{1}{2} at^2[/tex]
Where d is the distance travelled, v is the initial velocity, a is acceleration, and t is time.
If the clown is dropped, they have an initial velocity of 0 (zero). We assumed only gravity acts on the clown, so acceleration equals the gravitational acceleration on earth. [tex]a = 9.8m/s^2[/tex]
The distance the clown travels is 10-m from the diving board to the surface of the water.
Let's solve. [tex]10 = 0*t + \frac{1}{2} (9.8) t^2 \rightarrow 20/9.8 = t^2 \rightarrow t = \sqrt{20/9.8}[/tex]
Now that we know time, we can calculate how fast the clown needs to be running when they leap from the diving board to cover a distance of 15-m (Remember, half the width of the pool.)
Using our equations of motion, we know that [tex]d = vt + 0.5at^2[/tex]
We assumed no forces act horizontally on the clown, therefore a = 0. We just need to solve for v. Substituting in the time we just solved for, we get something like this. [tex]15 = v \sqrt{20/9.8}[/tex]
I'll leave it to you to solve this equation.
Can any one here form light from lemon?
Answer:
I did not get it
Explanation:
what u r saying
-CIVICS- Do you feel it is important to be civically engaged in your community? Why or why not?
Answer:
I feel it's important to be civilly engaged in my community because it gives me a sense of placement and home in my own community. It also allows me to feel that my voice is being heard and not ignored.
Think about the types of forces holding the atoms together in different chemicals. Are there any patterns that can be drawn from the data? Explain.
Hello. You did not enter the data to which this question refers, which makes it impossible for it to have an exact answer. However, I will try to help you in the best possible way.
The forces that hold the elements together are called intermolecular forces. They are formed by covalent bonds between the molecules and can be called: dipole-induced (occurs between nonpolar molecules that have a negative pole and a positive pole) and dipole-dipole (occurs between polar moileculas, except when hydrogen is present).
4. If the velocity of the particles is high, they will collide with each other with less force.
a. TRUE
b. FALSE
Answer:
7657
Explanation:
b. FALSE
If the velocity of particle is high then they will collide with each other with a greater force because their momentum will be high
What is force?force is a push or pull on a body .
What is momentum?Momentum is the product of mass and velocity,
More the velocity, higher will be the momentum.
since force is directly proportional to rate of change of momentum
F = Δp/Δt
so on when bodies having higher velocities collide their rate of change of momentum is higher hence more will be the force
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A person’s blood type depends on the type of protein marker, called an , found on the cell membranes of the red blood cells.
A person’s blood type depends on the type of protein marker, called an Antigen, found on the cell membranes of the red blood cell.
What is antigen?A molecule known as an antigen is one that triggers the formation of an antibody and the immune system's response.
Large protein molecules known as antigens are found on the surface of pathogens like bacteria, fungi, viruses, and other foreign substances. When these dangerous substances enter the body, the body's immune system reacts by producing antibodies.
The ABO system distinguishes 4 major blood types:
Blood group O - has no antigens, but both anti-A and anti-B antibodies in the plasma. Blood group AB - has both A and B antigens, but no antibodies.Blood group A - has A antigens on the red blood cells with anti-B antibodies in the plasma. Blood group B - has B antigens with anti-A antibodies in the plasma.Learn more about antigen here:
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Select all of the ways collection areas use to gain water.
Question 1 options:
water evaporates from the collection area
runoff from precipitation
precipitation falls direction into the collection area
Answer:
runoff from precipitation
precipitation falls direction into the collection area
Explanation:
i took the test
A collection area gains water as runoff from precipitation or precipitation falling into the collection area.
A collection area is an area set aside for the purpose of collecting water. This water could come into the collection area as precipitation or as surface run off.
Hence, a collection area could gain water via;
runoff from precipitationprecipitation falling into the collection areaOut of the options in the questions, these are two ways in which collection areas can receive water.
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A friend of yours is wearing a green shirt. Why is their shirt green?
Q1. That is, what gives the shirt the green color that you perceive when you look at it?
Q2. Now, if your friend walked into a totally dark room, what color would the shirt appear?
Explain.
1. A claim (one sentence stating what you know)
2. 3 pieces of evidence
3. Reasoning
Answer:
The answer is the shirt would disappear because I would eat him
What forces act to pull the poles of a magnet together, or to push them apart?
Answer:
Gravity,
I hope this correct
Which circuit element controls the flow of current?
Answer:
REGULATOR
Explanation:
Because of the costs involved in maintaining high temperatures and pressure, nuclear method for generating electrical energy. is not yet a practical Which best completes the statement?
Answer:
Fusion or energy because I had that question in my school so I wrote it in my notes book so it fusion or energy I don’t now hop this help you
Explanation:
When two forces exerted on an object are balanced, the object
Answer: Will not accelerate.
Explanation: When all the forces acting upon an object balance each other, the object will be at equilibrium; it will not accelerate.
fill in the blanks (about force)
depends on _____ and _____
. Work done by a force depends upon force applied and displacement produced.
A 15 kg box sits still on a rough inclined plane (no math required here).
Why isn’t the box sliding down the hill?
Answer:
Explanation:
The force of friction equals the sine component of the force due to gravity
PLEASE HELP WILL GIVE BRAINLIEST!!! DUE SOON!! GIVE ME 2 REASONS WHY
why is water further away from the shore colder the further you go?
Answer:
★ For example, cold water has a higher density than warmer water. In Addition, water gets colder with depth because of the coldness, of the salty ocean water which sinks to the bottom of the ocean basins below the less dense water near the surface
Explanation:
Hope you have a great day :)
