How many paired sets of electrons would be found on an electron dot model of sulfur?

Which equation is most likely used to determine the acceleration from a velocity vs:time graph?

tresset_1 [31]

Acceleration, a = (v - u)/t

where v is the final velocity, u is the initial velocity, and t is the time.

This formula on a velocity time graph represents the slope of the graph.

7 0

3 years ago

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General relativity, rather than special relativity, must be used for which kind of frame of reference

gregori [183]

The answer is B. A frame of reference that is accelerating.

6 0

3 years ago

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While at the county fair, you decide to ride the Ferris wheel. Having eaten too many candy apples and elephant ears, you find th

Dovator [93]

Answer:

Explanation:

From the given information:

radius = 15 m

Time T = 23 s

a) Speed (v) = $\dfrac{2 \pi r}{T}$

$v = \dfrac{2\times \pi \times 15}{23}$

v = 4.10 m/s

b) The magnitude of the acceleration is:

$a = \dfrac{v^2}{r} \\ \\ a = \dfrac{(4.10)^2}{15}$

a = 1.12 m/s²

c) True weight = mg

Apparent weight = normal force

From the top;

the normal force = upward direction,

weight is downward as well as the acceleration.

true weight - normal force = ma

apparent weight =mg - ma

$\dfrac{apparent \ weight}{true \ weight} = \dfrac{(mg - ma)}{(mg)}$

$=1- \dfrac{1.12}{9.8}$

= 0.886 m/s²

d)

From the bottom;

acceleration is upward, so:

apparent weight - true weight = ma

apparent weight = true weight + ma

$\dfrac{apparent \ weight }{true \ weight} =\dfrac{ mg + ma}{mg}$

$\dfrac{apparent \ weight }{true \ weight} =1+ \dfrac{a}{g} \\ \\ = 1 + \dfrac{1.12}{9.8}$

$= 1 + \dfrac{1.12}{9.8} \\ \\$

= 1.114 m/s²

6 0

3 years ago

Captain Kiddo is trapped inside a submarine. In order to escape, she first needs to open a heavy revolving door.

Annette [7]

Answer:

a) It will be easier to apply all her force as far as possible from the axle

b) There is a net torque applied

Explanation:

a) Applying a larger force far away from the axle of the door produces a larger force on the torque than pushing it near the axle. This is because Increasing the lever arm between the axle and the point at which you push the door increases the torque on the door

b)The door is turning faster and faster because you are exerting a torque on it and its undergoing angular acceleration. There is a net torque which is the addition of the torque applied on the opposite sides of the door

4 0

3 years ago

A wire of resistivity ? must be replaced in a circuit by a wire of the same material but 4 times as long. If, however, the resis

Darya [45]

Answer:

2 times the diameter of the original wire.

Explanation:

Let's call $\rho$ the resistivity of the wire. The original resistance of the wire is given by

$R=\rho \frac{L}{A}$

where L is the length of the wire and A is the cross-sectional area. Writing the area as

$A=\pi (\frac{d}{2})^2$

where d is the diameter and d/2 corresponds to the radius, we can rewrite the resistance of the wire as

$R=\rho \frac{L}{\pi (d/2)^2}=4\frac{\rho L}{\pi d^2}$

Which can be rewritten solving for d, the diameter:

$d=\sqrt{\frac{4\rho L}{\pi R}}$

Now, we know that the wire must be replaced by a wire with same material (so, same resistivity $\rho$ ), but with 4 times long, which means the new length is $L'=4L$ . Substituting this into the formula, and keeping in mind that the resistance R must remain the same, we find the new diameter:

$d'=\sqrt{\frac{4 \rho L' }{\pi R}}=\sqrt{\frac{4 \rho (4L) }{\pi R}}=2\sqrt{\frac{4 \rho L' }{\pi R}}=2d$

so, the diameter must be

2 times the diameter of the original wire.

5 0

3 years ago