Answer:
1 kilometer is equivalent to 1,000,000 <(million) millimeters
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
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:
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?
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
Calculate the running costs of a filament lamp with a 60 W bulb and a CFL lamp with a 15 W bulb for 15 hours.
1 kWh costs 10p.
cost = power (kW) × time (hours) × price (per kWh)
Answer:
the cost of running the bulbs is 11.25p
Explanation:
Given;
cost of running 1 kwh = 10 p
power of filament bulb, P = 60 W
power of the CFL bulb, P = 15 W
time of power consumption, t = 15 hours
Total Energy consumed;
E = (60W + 15W) x 15 hours
E = (75)(15)
E = 1125 Wh
E = 1.125 kWh
Cost of 1.125 kWh = 1.125 x 10p
= 11.25p
Therefore, the cost of running the bulbs is 11.25p
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
A 62 kg male ice skater is facing a 42 kg female ice skater. They are at rest on the ice. They push off each other and move in opposite directions. The female skater moves backwards with a speed of 3.7 m/s. What is the velocity of the male skater?
The velocity of the male skater is 2.5 m/s in opposite to the direction of the female skater moving.
What is the law of conservation of momentum?According to the law of conservation of momentum, The overall momentum of two or more bodies acting on one another in an isolated system stays constant unless an external force is introduced. As a result, momentum cannot be gained or lost.
Given parameters:
The mass of the male ice skater is: M = 62 kg.
The mass of the female ice skater is: m = 42 kg.
Initially both of them are in rest.
After they push off each other and move in opposite directions, the female skater moves backwards with a speed of v =3.7 m/s.
Let the speed of the male ice skater is V m/s now.
From the law of conservation of momentum:
MV + mv = 0
V = - mv/M
= - (42×3.7)/62 m/s
= - 2.5 m/s
Hence, the velocity of the male skater is 2.5 m/s in opposite to the direction of the female skater moving.
Learn more about momentum here:
https://brainly.com/question/29113044
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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
To know more on force here
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A train reaches a speed of 35.0 m/s after accelerating at a rate of 5.00 m/s2 over a distance of 40.0 m. What was the train’s initial speed?
Answer:
Initial velocity, U = 28.73m/s
Explanation:
Given the following data;
Final velocity, V = 35m/s
Acceleration, a = 5m/s²
Distance, S = 40m
To find the initial velocity (U), we would use the third equation of motion.
V² = U² + 2aS
Where;
V represents the final velocity measured in meter per seconds.
U represents the initial velocity measured in meter per seconds.
a represents acceleration measured in meters per seconds square.
S represents the displacement measured in meters.
Substituting into the equation, we have;
35² = U + 2*5*40
1225 = U² + 400
U² = 1225 - 400
U² = 825
Taking the square root of both sides, we have;
Initial velocity, U = 28.73m/s
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.
what is refractive index ?
Explanation:
Refractive Index is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter ‘n’ or n’ in a descriptive text and mathematical equations.
fill in the blanks (about force)
depends on _____ and _____
. Work done by a force depends upon force applied and displacement produced.
30 points must be a legitimate answer and correct answer or I will report
A wave travels at a constant speed. How does the frequency change if the wavelength is reduced by a factor of 3?
A. The frequency increases by a factor of 9.
B. The frequency increases by a factor of 3.
C. The frequency decreases by a factor of 3.
D. The frequency does not change.
Answer:
it's C
Explanation:
have a nice day............
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 circuit element controls the flow of current?
Answer:
REGULATOR
Explanation:
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.
Which is a testable hypothesis involving an independent and dependent
variable?
O A. The atmosphere contains different gases.
O B. The properties of solids differ from the properties of gases.
O C. Gold is a solid a room temperature.
OD. If gold reaches a high enough temperature, it will become
liquid.
HELP NEEDED
Answer:
i think od maybe
Explanai tion:
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 :)
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 :)
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.
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.
Learn more about surface runoff: https://brainly.com/question/998881
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
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.
-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.
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:
Do you hear sounds around you as one frequency at a time or as many frequencies at once?
Answer:
The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea.
Explanation:
hope it help
mark me as brainliest
Answer:
20 Hz to 20 kHz. Humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz.
Explanation:
learned this in physics about 2 years ago and its stuck with me ever since lol. sorry i am not the best at explaining lol
why would a bouncing ball eventually stop bouncing?
How could the speed of a car be determined?
Answer:
try the formula v=s/t
v= velocity
s= speed
t=time
Explanation:
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.
Please help me with this! :)
