Let initial velocity be v
So
initial kinetic energy
KE=1/2mv²Final velocity is four times v i.e 4v
Final kinetic energy
KE=1/2m(4v)²KE=1/2m(16v²)Find ratio
1/2m(16v²):1/2mv²16v²:v²16:1Or
1:16Option C
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Inboard gasoline boats built after july 31st, 1981 must have what type of ventilation system?.
Inboard gasoline boats built after July 31st, 1981 must have a mechanical type of ventilation system.
What is a mechanical ventilation system?A mechanical ventilation system can be defined as a device in which circulates fresh/cold currents of air.
A mechanical ventilation system is based on the use of systems of ducts capable of ventilating the device.
In conclusion, inboard gasoline boats built after July 31st, 1981 must have a mechanical type of ventilation system.
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An isotope of Technetium has a half-life of 6 hours. If it is given to a patient as part of a medical procedure,
what fraction of the radioisotope remains in the body after one day?
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 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:
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.
PLEASE HELP ME!!!
predict the products of each of the following equations. Then explain how you made your predictions. Be sure to balance the equations.
___NaBr + ___Ca → _______ + _______
___Mg + ___O2 → _______
#1
Here
Calcium is less reactive than sodium so it can't displace Na .
Nothing will happen
#2
Mg+O_2—»MgOThis is oxidation
A boy starts from a car and skateboards 7 meters towards the west, then continues skateboarding 2 meters towards the west. What is the boy
's displacement from the car?
A 5 meters west
B 7 meters west
C7.6 meters east
D 9 meters west
E 6 meters south
True or false: Mass is a scalar quantity. * (10 Points)
Answer: True
Explanation:
A scalar quantity is those quantities that only have magnitude and no direction. Therefore the value doesn't change with direction.
A bullet of mass 0.045 kg is travelling horizontally at 400 m/s when it strikes a stationary wooden block of mass 16 kg. The bullet is embedded in the block. Calculate the speed of the block with the bullet embedded within.
Velocity: m/s
Answer:9.17 m|s
Explanation:
explanation shown
Apply conservation of momentum
[tex]\\ \rm\Rrightarrow m1v1+m2v2=(m1+M2)v3[/tex]
[tex]\\ \rm\Rrightarrow 0.045(400)+16(0)=(0.045+16)V3[/tex]
[tex]\\ \rm\Rrightarrow 18=16.045v3[/tex]
[tex]\\ \rm\Rrightarrow v3=1.12m/s[/tex]
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.
3
What increase in temperature will result if 225.0 g of copper absorbs 5000 J of
heat energy? The specific heat of copper is 0.385 J/g °C
Calculate: Q=m XCXAT
(2 points)
57.7 °C
433.125 °C
274.6 °C
22.2 °C
The increase in temperature that will result if 225.0 g of copper absorbs 5000 J of heat energy is 57.72°C.
How to calculate temperature change?The temperature change of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature5000 = 225 × 0.385 × ∆T
5000 = 86.63∆T
∆T = 5000/86.63
∆T = 57.72°C
Therefore, the increase in temperature that will result if 225.0 g of copper absorbs 5000 J of heat energy is 57.72°C.
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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
Find the markdown price. Shelly Ward purchased a mountain bike for 35 percent off the regular price of $899. how much is the markdown?
The markdown price for a mountain bike is $584.35
What is markdown price?Markdown price is the discount offered by the shopkeepers to the customers to increase the sales rate.
M.P = S.P (1-r/100)
The following expression can be used every time we have to find the markdown price.
Substitute Selling price S.P =$899 and the percent r =35/100 =0.35, we get
M.P = $899(1-0.35)
M.P =$584.35
Thus, the markdown price is $584.35
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pls complete this table thankyou
Answer:
1)10 m/s
2) 20 m/s
3) 2 s
4) 500 m
5)1000 km/h
Average speed = distance travelled / time.
( note: distance must be in (m) and time in sec, if not then you convert ).
1) average speed = 20/2 = 10mls.
2) average speed = 100/5 = 20 m/s.
3) since we aren't given (time) let's call it x
so we replace the unknown time with x..
average speed = 2/x = 1
then cross multiply
you get x (the unknown time) as 2s {seconds}.
(to check if it's correct just add the time we got back into the equation and see if you would get a erage speed as 1m/s).
4) do the same, replace distance as x or any letter you want )
average speed = x/ 10 = 50
cross multiply
you get x = 500m {meters}
5) (we need to convert km to meters and time to secs because that's what we are working with).
200km = 200,000 m { to convert to meters you multiply the given by 1000, 1km = 1000m).
for 2h, we know that:
60 seconds makes 1 minute
60 minutes makes an hour.
so we multiply 60 by 60 we get 3600mins then we multiply it by 2 to get 7200 secs
so now
Average speed = 200,000/7200 = 27.77 m/s.
Here you go..
hope this helps
Good luck and ace that test.
Determine the angular velocity ω of the telescope as it orbits around the Sun.
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
If light travels at 3.00 x 10° m/s, how long does it take light from lightning to reach your house if the bolt was 6.4 x 103
m away from your house?
Answer:
2.13 x 10^-5
Explanation:
light travels at 3.00 x 10^8 m/s
it's like if someone asks how long would it take for a car to go 100 miles if it's traveling 50 miles per hour
you would do
100 ÷ 50
6.4 x 10^3 ÷ 3.00 x 10^8
2.13 x 10^-5
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 :)
Hip hop dance translate feelings and emotions of human conditions, situations, or fantasies into movement and dramatic expressions? True or false?
Answer:
false .....................
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 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
Please heelllllpppppppppppopppppop
Answer:
Explanation:
I'm assuming you need this answer quickly.
Using what we know:
The energy of a single 400 nm photon is 3.1 eV.
So a photon of 412 nm wavelength would have the energy of 4.0 ev.
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 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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When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be ___.
When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.
What is type S fuse?
Type S fuses are also called tamper proof fuses because each fuse size has a different base and thread size.
These fuses also require the use of a special adapter which is screwed into the standard Edison base of the fuse holder.
Thus, when plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.
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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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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.
The speed of a 120 meter long train is 54 km per hour. it crosses a bridge in 32 seconds.
1. determine the length of the bridge in kilometer.
2. determine the speed of the train in kilometer per hour to cross the bridge in 24 seconds.
3. determine the length of the train when the speed of the train is 54 km per hour and it cross the bridge in 36 seconds.
1. The length of the bridge is 360 m.
2. The speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.
3. The length of the train when it cross the bridge in 36 seconds is 540 m.
What is speed?
Speed is the ratio of distance traveled and the time taken to cover that distance.
1.
The speed of train m/s is 54 x 5/18 = 15 m/s
The train crosses the bridge in 32 s, distance traveled by train will be
=32 x 15 =480m
The length of the bridge = (480 -120) =360 m
Thus, the length of the bridge is 360 m.
2.
Speed of train in m/s to cross the bridge in 24 s
= 480/24 = 20 m/s
Speed in km/hr =20 x 18/5 = 72 km/hr
Thus, Speed of train in km/hr to cross the bridge in 24 s is 72 km/hr.
3.
Speed of train in m/s =15 m/s
Train crosses the bridge in 36 s, then length of train will be
= 15 x 36m = 540m
Thus, the length of the train when it cross the bridge in 36 seconds is 540 m
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How do u solve this with steps really need help asap
Answer:
170 N
Explanation:
Impulse is the change in momentum. Momentum is the product of mass and velocity. These are related to applied force by ...
F·Δt = m·Δv
__
Here, the velocity goes from 0 to 34 m/s in 0.0116 s. The mass is 0.058 kg. Filling in the given values, we have ...
F(0.0116 s) = (0.058 kg)(34 m/s)
F = 0.058×34/0.0116 kg·m/s² ≈ 170 N
The required force is 170 newtons.
1. The distance between a trough and a crest on a transverse wave is 12.0cm. If cycles of the wave pass a fixed point in one second, calculate the speed of the wave.
Answer:
0.12m/s
Explanation:
v=λf
Given that, λ = 12cm = 0.12m
T = 1second
(A period T is the time required for one complete cycle of vibration to pass a given point)
frequency 'f' is unknown but we can get frequency from f = 1/T = 1/1 = 1Hz
therefore, v= 0.12 × 1 = 0.12m/s
