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3 years ago

Please answer this science question NO LINKS !!!!

Physics

1 answer:

Sergeu [11.5K]3 years ago

4 0

FNet = Fa + Fg. Is the formula. I think the 20 should be right

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If the temperature of the steam in a pwr is 315°c (600°f), what is the maximum efficiency obtainable from the power plant?

barxatty [35]

The answer is <span>The power will decrease to 75 percent of its previous value

</span>

8 0

3 years ago

A cannon fires a 0.2 kg shell with initial velocity vi = 9.2 m/s in the direction θ = 46 ◦ above the horizontal. The shell’s tra

Sedbober [7]

Answer:

∆h = 0.071 m

Explanation:

I rename angle (θ) = angle(α)

First we are going to write two important equations to solve this problem :

Vy(t) and y(t)

We start by decomposing the speed in the direction ''y''

$sin(\alpha) = \frac{Vyi}{Vi}$

$Vyi = Vi.sin(\alpha ) = 9.2 \frac{m}{s} .sin(46) = 6.62 \frac{m}{s}$

Vy in this problem will follow this equation =

$Vy(t) = Vyi -g.t$

where g is the gravity acceleration

$Vy(t) = Vyi - g.t= 6.62 \frac{m}{s} - (9.8\frac{m}{s^{2} }) .t$

This is equation (1)

For Y(t) :

$Y(t)=Yi+Vyi.t-\frac{g.t^{2} }{2}$

We suppose yi = 0

$Y(t) = Yi +Vyi.t-\frac{g.t^{2} }{2} = 6.62 \frac{m}{s} .t- 4.9\frac{m}{s^{2} } .t^{2}$

This is equation (2)

We need the time in which Vy = 0 m/s so we use (1)

$Vy (t) = 0\\0=6.62 \frac{m}{s} - 9.8 \frac{m}{s^{2} } .t\\t= 0.675 s$

So in t = 0.675 s → Vy = 0. Now we calculate the y in which this happen using (2)

$Y(0.675s) = 6.62\frac{m}{s}.(0.675s)-4.9 \frac{m}{s^{2} } .(0.675s)^{2} \\Y(0.675s) =2.236 m$

2.236 m is the maximum height from the shell (in which Vy=0 m/s)

Let's calculate now the height for t = 0.555 s

$Y(0.555s)= 6.62 \frac{m}{s} .(0.555s)-4.9\frac{m}{s^{2} } .(0.555s)^{2} \\Y(0.555s) = 2.165m$

The height asked is

∆h = 2.236 m - 2.165 m = 0.071 m

6 0

4 years ago

While driving down the road, this tiny hummingbird hit the windshield of a Maria's car. This is a clear case of Newton's third l

frutty [35]

The hummingbird hit the car and the car hit the hummingbird.

The forces are equal and opposite. <em> (A) </em>

It doesn't matter if the car ran into a mosquito, a bowling ball, or a battleship. The forces are equal and opposite.

5 0

3 years ago

Read 2 more answers

John is hiking and notices a small stream of water flowing down the side of the mountain. What part of the water cycle is John o

Alexus [3.1K]

Answer: Runofff

Explanation: because it said that it is going down the side of the mountain

3 0

3 years ago

What is the period of a pendulum that takes 5 seconds to make a complete back and forth vibration

dezoksy [38]

Answer:

Explanation:

-A period is the time it takes to make one full back-and-forth swing.

-A period is calculated as the time taken for a complete swing divided by one cycle:

$T=t/1c\\\\=5s/1\\\\=5s$

Hence, the period of the pendulum is 5s

8 0

4 years ago