Conservation of energy - questions

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A bottle lying on the windowsill falls off and takes 4.95 seconds to reach the ground. The distance from the windowsill to the ground is 120.00 meters. Find the time the bottle would take to land if it were to fall the same distance on the moon instead of Earth.
A patient with type A blood is accidentally given a transfusion of type AB blood. Which of the following correctly describes what will happen in the patient's body?
A 92.6 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate cake rated at 735 (food) Calories. How high must the person climb? The acceleration due to gravity is 9.8 m/s 2 and 1 food Calorie is 103 calories. Answer in units of km.
When an airplane\u2019s ailerons move in opposite directions they usually cause a plane to:"?
At a temperature of 280k, the gas in a cylinder has a volume of 20.0 liters.If the volume of the gas is decreased to 10.0 liters, what must the temperature be for the gas to remain at a constant pressure?

as a drivers vehicle approaches an intersection at 20 m/s the driver applies the brakes in order to stop creating a uniform acceleration of 2.3 m² calculate the time required to stop

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Answer:

8.70 seconds.

Explanation:

1. Use the kinematic equation: v = u + at,

v = final velocity

u = initial velocity

a = acceleration

t = time.

Find variables and numbers:

v = ?

u = 20 m/s

a = -2.3 m²

v = 0 m/s

Rearrange values: t = (v - u) / a.

Plugging in the values: t = (0 - 20) / (-2.3) = 20 / 2.3

Of waterfalls with a height of more than 50 m , Niagara Falls in Canada has the highest flow rate of any waterfall in the world. The total average flow rate of the falls is 2.80×10³ m³/s and its average height is 52.0 m (Niagara Falls Live, 2017). Given that the density of water is 1.00×10³ kg/m³, calculate the average power output of Niagara Falls.Average power output: _________.

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The height of more than 50 m then the average power output of Niagara Falls will be equal to 426.9 MW.

What is Power?

Power can be defined as the amount of workcompleted in a given amount of time. Watt (W), which is derived from joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is a unit of measurement sometimes used to describe the power of motor vehicles and other devices.

Average power is calculated by dividing the total energy used by the total time required. The average quantity of work completed or energy converted per unit of time is known as average power.

The change in potential energy of the falls mostly determines its power output:

Q = -ΔP = -(P2 - P1)

Use the equation of Potential energy:

P = mgh

If we take the base of the falls as the reference height, the height at point 1 is 52 meters, and at point 2 h=0, P2=0,

Q = P1 = mgh

The rate of change in potential energy over time can be calculated by substituting the mass rate M for m. As a result, the power produced:

W = mgh

W = 2.8 × 10³ × 1 × 10³ × 9.8 × 52

W = 1426.9 MW.

To know more about Power:

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Answer:

Power output: W=1426.9MW

Explanation:

The power output of the falls is given mainly by its change in potential energy:

$Q=-P_(tot)=-(P_(2)-P_(1))$

The potential energy for any point can be calculated as:

$P=m*g*h$

If we consider the base of the falls to be the reference height, at point 2 h=0, so P2=0, and height at point 1 equals 52m:

$Q=P_(1)=m*g*h$

If we replace m with the mass rate M we obtain the rate of change in potential energy over time, so the power generated:

$W=M*g*h=2.8*10^(3)m^(3)/s*1*10^(3)kg/m^(3)*9.8m/s^(2)*52m =1426.9MW$

Susan works 8 hours a day and makes $7.00 per hour. How much money does Susan earn in one week if she works 5 days per week?

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Get the amount of money in a day, (8)(7)=$56 per day
5 days per week, 56(5)=280
To conclude, she gets $280 in a week.

8 multiplied by 7-$56(this is the amount she got in one day of work)
56 multiplied by 5-(This amounts to the total she is paid) equals-$280

SPEAR is a storage ring at the Stanford Linear Accelerator which has a circulating beam of electrons that are moving at nearly the speed of light (2.998 108 m/s). If a similar ring is about 92.0 m in diameter and has a 0.40 A beam, how many electrons are in the beam

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Answer:

$2.4* 10^(12)$

Explanation:

We are given that

Speed of light,v= $2.998* 10^8 m/s$

Diameter of ring,d=92 m

Radius,r= $(d)/(2)=(92)/(2)=46 m$

Current, I=0.40 A

We have to find the number of electrons in the beam.

We know that

Current,I= $(q)/(t)$

Where q= ne

$e=1.6* 10^(-19) C$

Using the formula

$0.40=(1.6* 10^(-19)n)/((2\pi r)/(v))$

$0.40=(1.6* 10^(-19)n* v)/(2\pi r)$

$0.40=(1.6* 10^(-19)n* 2.998* 10^8)/(2\pi* 46)$

$n=(0.40* 2\pi* 46)/(1.6* 10^(-19)* 2.998* 10^8)=2.4* 10^(12)$

The captain told the passengers that the plane is flying at 450 miles per hour. This information describes the plane's

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the speed of the plane

When you sit indoors near a window on a sunny day your skin gets warm how does this happen?F. The Suns energy reaches your skin as radiation.
G. Heat from the sun reaches your skin by conduction.
H. The Suns energy is conducted to your skin by the glass
I. Heat from the room is reflected from the Windows onto your skin

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Well, we know it's NOT I., because only LIGHT gets reflected.
We know it's NOT G., because conduction requires some pathway that actually CONNECTS to us, and a window can't "connect" to us.
H. is the same reason as G., and the problem didn't state that it touches or "connects" to us.
So that leaves only to A., and YES, it could reach our skin through radiation!
I hope I helped! =D

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