Answer:
150w
Explanation:
power = workdone/time
9000/60
150w
Select the correct answer from each drop-down menu. andrew pokes a marble, and the marble rolls down a ramp. the marble moves with speed. which forces are acting on the marble in this situation? when andrew pokes the marble, he gives it force. as the marble rolls down the ramp, force pulls it down. the movement of the marble is slowed down by from the ramp.
A net forward force as well as gravitational force pulls the marble downwards whereas frictional force slows it down.
What is a force?A force is an agent which causes a change in the motion or state of an object.
Forces are of two types:
Contact forces andNon-contact forcesAndrew applies force on the marble causing it to move.
When Andrew pokes the marble, he gives it net forward force. As the marble rolls down the ramp, gravitational force pulls it down.
The movement of the marble is slowed down by frictional force from the ramp.
Therefore, a combination of applied force and gravitational force moves the marble forward, while frictional force slows it down.
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Answer:
Applied, Gravitational, and Frictional.
Explanation
hope it helps :)
a 55kg skater is speeding towards a ramp. if the skater reaches a height of 0.8m before coming to a stop, how fast was the skater going in the beginning? ignore any friction.
Answer:
3.96 meters / sec
Explanation:
The skaters Kinetic Energy is converted to Potential Energy ( ignoring friction)
KE = PE
1/2 * 55 * v^2 = 55 * 9.81 * .8
solve for v = 3.96 m/s
A body which is uniformly decelerated comes to rest in 5s after travelling of 10m. What is its initial velocity a distance
Answer:
4 m/s
Explanation:
v=u+ at and v^2=u^2+2as.
It is given that v=0,t=5 s and s=10 m.
⇒0=u+5a and 0=u^2+20a.
⇒a=−u/5 and a=−u^2/20.
⇒u/5 = u^2/20⇒u=4 m/s.
⇒ The initial velocity is 4 m/s.
In 1993, the gold reserves in the United States were about 8.490 x 10^6
Volume?
Let's see
Volume:-
Mass/Density8.49×10⁶/193000.000439×10⁶439m³A gas has a variable volume.
True
False
Answer:
True
Explanation:
Gas always live in free state but some gas is not . We can said that mostly gas volume can be changeable during disturbing by environment situation.
What is the mass of an object that accelerated at 5 m/s^2 and with a force or 45 N ?
The mass of the accelerated object is 9kg.
What is Newton's second law of motion?According to this law, the force is equal to the product of mass of the object and its acceleration.
F =ma
Given is the force F =45 N and the acceleration is 5 m/s², then the mass will be
m = F/a
m = 45/5
m =9kg
Thus, the mass of the object is 9kg.
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A train travels a distance of 1275 m at 92.1 m/s how long does it take?
1180 s
117.000 s
13.85
0.0722 s
The time taken by the train will be 13.84 sec. Time taken is the ratio of the distance and speed.
What is distance?Distance is a numerical representation of the distance between two objects or locations.
Distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.
Distance is found as the product of the speed and velocity.
Distance = speed × time
time = Distance/speed
time= 1275 (m)/92.1( m/sec)
time(t) =13.84 sec
Hence, the time taken by the train will be 13.84 sec
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can some one solve this for me please
#solid in liquid
gelatin#solid in gas
Dry ice(CO2)#solid in solid
synthesized gems#solid in liquid
magma#Liquid in a gas
Methane11. Which of these is a way to make an electromagnet stronger?
a putting a switch in the electrical circuit
b replacing the iron core with a copper core
© replacing the copper wire with plastic wire
wrapping the wire around the iron core more times
Answer:
wrapping around the wire around iron core several times
Explanation:
adding more turns to the coil. increasing the current flowing through the coil.
When friction occurs, which of the following types of energy is produced?
оооо
chemical energy
electromagnetic energy
heat energy
nuclear energy
Answer:
heat energy
Explanation:
Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.
Which of the following is an example of kin selection? A. A wolf attacks its cousin over territorial rights. B. A snake eats the eggs of another snake. C. A badger attacks a bear who was foraging for food. D. A bobcat fights a wolf to protect younger bobcats.
Answer: D. A bobcat fights a wolf to protect younger bobcats.
A light-year is a unit generally used to express the distance that light travels in one year. Which of these can be expressed in the light years?
A] the age of a rock
B] the distance between two stars
C] the speed at which the earth revolves around the sun
D] the time earth takes to complete a revolution around the sun
The option that can be expressed in light years is " the distance between two stars." The correct option is B.
What is a light year?A light-year is a unit of distance used to measure astronomical distances. It is defined as the distance that light travels in one Earth year in the vacuum of space, which is approximately 9.46 trillion kilometers (5.88 trillion miles). Light travels at a speed of about 299,792,458 meters per second (or approximately 186,282 miles per second), which means that in one year, light can cover a distance of 9.46 trillion kilometers. Light years are commonly used to measure the distance between stars and galaxies, and since space is vast, other units of distance are often not practical.
Here in the Question,
A] The age of a rock is a measure of time, usually in millions or billions of years, and cannot be expressed in light years, which is a unit of distance.
C] The speed at which the Earth revolves around the sun is measured in kilometers per second or miles per hour and represents a velocity, not a distance. Hence it cannot be expressed in light years.
D] The time it takes for Earth to complete a revolution around the sun is measured in days or years and is again a measure of time, not distance. So it cannot be expressed in light years.
Therefore, Only B The distance between two stars is a measure of distance, which can be expressed in light years since it is a vast distance and other units may not be suitable.
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A positive charge is placed in the center of an uncharged metal spherical shell with some thickness as shown above.
1. Draw the electric field that exists inside the empty volume enclosed by the shell.
(Empty except for
the positive charge.) Explain your drawing either in words or through use of a
diagram, or both.
2. Draw the electric field that exists inside the metal shell. Explain your drawing
either in words or
through use of a diagram, or both.
3. Draw the electric field that exists outside of the metal shell. Explain your drawing
either in words or
through use of a diagram, or both.
The drawing of the positive charge showing the electrical fields inside the empty volume enclosed by the shell is attached accordingly. See explanation below.
What is the explanation of the drawing the positive charge inside the center of the uncharged spherical metal?The electrostatic potential at any location outside the shell, assuming the center of the shell is Z, equals Z/4π∈₁r, where r is the distance from O.
It's also worth noting that the spherical shell's outer surface is an equipotential shell, which means that the electric field at any place inside the shell except O is zero.
Because the shell is metallic, charge Z will induce uniformly on the inner surface and +Z will induce uniformly on the outer surface, with O as the charge center.
As a result, an electric field will exist both within and outside the shell, but the total charge will remain the same.
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Which is the last stage in the life cycle of an average star? (1 point)
A.white drawf
B.super red giant
C. planetary nebula
D.neutron star
Answer:
The answer is A. White Dwarf
Explanation:
average stars like sun end their life as white dwarf surrounded by disappearing planetary nebula.A machine which has an energy loss of 10% will have efficiency of
Answer:
90%
Explanation:
if you lose 10% of a 100 you get 90
When blue light shines into a prism what happens?
Answer:
Blue light has the shortest wavelength amongst all the colours that combine to make white light. This means the blue light diffracts (bends) the most out of all of them. There will be no dispersion of colours because ideally, the blue light must consist of only one frequency.
An athlete runs 9km due east, then 18km north and finally 5km west. What is the total distance run? What is the resulting displacement of the hiker from the starting point?
Answer:
Distance: 32 km
Displacement: 18 km
Explanation:
Distance is the total amount travelled. Displacement on the other hand is how far away an object is from its starting point.
Distance is a scalar quantity meaning it only has magnitude. Displacement is a vector quantity meaning it has magnitude and direction.
Distance is represented by "x" while displacement is represented as "Δx".
Note that "Δ" is the Greek letter "delta" which is used to represent a change in something.
Let's start by finding the distance.
Since distance is the total amount travelled, we can just add all of the values.
9km + 18km + 5km = 32 km
Then, we can find the displacement.
North and East are positive while South and West are negative.
If the athlete ran 9km East and 5km West, their displacement would be:
9km - 5km = 4km East
Now, we can set up a triangle to determine the displacement from the starting point.
18km North would be the longer leg, 4km East would be the shorter leg, and the displacement would be the hypotenuse.
Using Pythagorean's Theorem we find that:
[tex]a^2+b^2=c^2\\4^2+18^2=c^2\\16+324=c^2\\340=c^2\\c\approx18[/tex]
Note that "a" and "b" represent the legs of the triangle while "c" represents the hypotenuse of the triangle.
The displacement is approximately 18m.
1. What is the energy of a photon of light with a wavelength (a) of 450 nm?
Answer:
2.76 eV
Explanation:
The Quanta of Light For example, a photon of blue light of wavelength 450 nm will always have 2.76 eV of energy.
Hip hop dance translate feelings and emotions of human conditions, situations, or fantasies into movement and dramatic expressions? True or false?
Answer:
false .....................
Which is not a formal planet?
A: neptune
B: uranus
C: saturn
D: jupiter
E: pluto
Answer:
Pluto
Explanation:
Pluto is now classified as a dwarf planet It used to be a formal planet but not anymore.
I need help with my homework please?
Refer to the attachments
Note that
Like charges attract each other and unlike charges repel each other
A driver traveling at 39.2 m/s spots a cop are and
hits the break. If he is able to brake for 2.1 seconds
and he accelerates at a rate of -7.6 m/s?, what is
his final speed?
Answer:
23.24 m/s
Explanation:
2.1 s * (-7.6 m/s^2) = - 15.96 m/s from original speed
39.2 - 15.96 = 23.24 m/s
A ball is thrown upward from the top of a building at an angle of 30.0° to the horizontal and with
an initial speed of 20.0 m/s. The point of release is 45.0 m above the ground. Neglect air resistance.
(i) How long does it take for the ball to hit the ground?
(ii) Find the ball’s speed at impact.
(iii) Find the horizontal range of the stone.
Answer:
See below
Explanation:
Vertical position = 45 + 20 sin (30) t - 4.9 t^2
when it hits ground this = 0
0 = -4.9t^2 + 20 sin (30 ) t + 45
0 = -4.9t^2 + 10 t +45 = 0 solve for t =4.22 sec
max height is at t= - b/2a = 10/9.8 =1.02
use this value of 't' in the equation to calculate max height = 50.1 m
it has 4.22 - 1.02 to free fall = 3.2 seconds free fall
v = at = 9.81 * 3.2 = 31.39 m/s VERTICAL
it will also still have horizontal velocity = 20 cos 30 = 17.32 m/s
total velocity will be sqrt ( 31.39^2 + 17.32^2) = 35.85 m/s
Horizontal range = 20 cos 30 * t = 20 * cos 30 * 4.22 = 73.1 m
Warren is a professional triathlete when doing an
Ironman, Warren swims 3.86km in 45 mins, then
bikes for 180.5 km in 5 hours and finishes by
running a marathon 42.2km in 2.75 hours. What is
Warren's average speed in Km/hr and m/s
Answer:26.7 and 7.4
Explanation:
So, first you add all the time up then the area travelled.
Firstly; 45 mins + 300 minutes(5 hours) + 165 minutes(2.75 minutes)= 510 minutes
Secondly; 42.2KM + 180.5KM + 3.86KM= 226.56KM
Finally: For hourly you would do: 510 divided by 60 to get 510 mins in terms of hours: so, 8.5 hours then you would do 226.56KM divided by 8.5 hours to get: 26.7Km/hr
For m/s: 7.4m/s
A glass rod with yellow crosses on it touches a sheet of silk covered with negative signs on it. the sheet of silk is sticking to the glass rod in several places. use the drop-down menu to answer the question. a student is going to produce static charge in a glass rod by rubbing it with a piece of silk. which method of transferring charge does this image illustrate?
The image as shown here can here can be used to describe charging by induction.
What is a charge?A charge may be positive or negative. One of the methods of transferring a charge is by induction.
In this case, an objects induces an opposite charge on a material. The image as shown here can here can be used to describe charging by induction.
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Answer:
friction
Explanation:
You are driving on a highway and your gas pedal gets jammed. You cannot reduce engine power. You should keep your eyes on the road and
You should keep your eyes on the road and shift into neutral when gas pedal gets jammed.
What is Neutral?In automobiles, shifting into neutral won't transmit power to the wheels and the direction of the steering wheel can still be controlled.
This helps to prevent accidents on the road as a result of such malfunctions in the car.
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If viewed at the correct time and in the right conditions, asteroids, comets, and meteors are all visible to the nked eye.
true or false
Answer:
True
Explanation:
If it is at right conditions and correct time (night time most likely) they will all be visible
The half-life of gold-198 is 2.7 days. After 5.4 days, how much of the original gold-198 remains?
A. one-half B. one-quarter C. all D. none
The the amount of the original gold-198 that remains after 5.4 days is one-quarter.
What is half-life?Half-life is the time required or taken for half the amount of matter present in a given substance to vanish or decay.
The half-life of gold-198 is 2.7 days.
After, 5.4 days, the gold would have undergone two half-lives.
The amount of matter remaining = 1/2 * 1/2 = 1/4
Therefore, the amount of the original gold-198 that remains is one-quarter.
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A metal artifact with a mass of 814.0 lbs and a length of 6.25 ft is recovered from the Queen Anne's Revenge wreckage site. It is believed to be a cannon. Unfortunately, the base of the cannon was not recovered, so it is a perfectly symmetrical metal tube. The outer circumference is 23.9 inches and the inner diameter of the bore is 11.5 cm. In order to care for it properly, it must be determined what type of metal it is composed of. What is the artifacts density in g/cm3
Answer:
discovered as obisdan
Explanation:
me ginus brooo
A motor lets a 450.N crate drop at a constant 5.75m/s. What is the power output of the motor?
A motor lets a 450.N crate drop at a constant 5.75m/s. What is the power output of the motor?
78.3W
2590W
444W
456W
Power is the energy per unit time required to run a machine. The output power of the motor is 2590 W.
What is power?Power is the product of force and velocity with which an object is moving.
P = F x v
Given is the force 450N and the velocity is 5.675 m/s, then the power is
P = 450 x 5.75
P = 2587.5 Watt
The power output of the motor is approximately 2590 W.
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