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salantis [7]
3 years ago
8

A book is dropped from a window. It takes 5 seconds to reach the ground. What is its velocity after 2 seconds? What’s the veloci

ty at the time when it hits the ground?
Physics
1 answer:
ira [324]3 years ago
3 0

Answer:

Explanation:

Initial velocity is 0. In the equation v = v0+at where v0 is the initial velocity of 0, we only have to fill in -9.8 for a and 2 for t to get the velocity after 2 seconds -19.6 m/s; after 5 seconds, when it hits the ground, a = -9.8 and t = 5 to give a velocity of -49 m/s. Gravity pulls down everything at the same rate, it doesn't matter whether we drop a feather or an elephant from the window!

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Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. A vending m
Igoryamba

Answer:

The percentage of legal quarters that will be rejected is 1.954 %.

Explanation:

Here we are required to find

P(X<5.48 or X>5.82)

We have μ = 5.67 and  σ = 0.07 where the range is between 5.48 and 5.82 we each z-score given by

z =\frac{x-\mu}{\sigma}

Therefore for 5.48 we have z_{5.48} = \frac{5.48 -5.67}{0.07} = -2.714

and for 5.82 we have   z_{5.82} = \frac{5.82 -5.67}{0.07} = 2.143

Therefore we have the area of interest on the normal distribution chart given by

P(Z<-2.714) + P(Z >  2.143) =  P(Z<-2.714) + (1 - P(Z <  2.143))

+  0.00336 + 1 - 0.98382 = 0.01954

= 0.01954 × 100 = 1.954 %

Therefore 1.954 percentage of legal quarters will be rejected.

3 0
3 years ago
What is the change in the cell voltage when the ion concentrations in the cathode half-cell are increased by a factor of 10?
VMariaS [17]
When the ion concentrations in the cathode half-cell are increased by a factor of 10, the change in the cell voltage is ln10 times greater. This comes from the Nernst equation. Use variation to solve for the cell voltage in terms of the initial cell voltage before increasing the ion concentrations by 10.
8 0
4 years ago
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A loop of wire carrying a steady current I is initially at rest perpendicular to a uniform magnetic field of magnitude B, as sho
seropon [69]

your answer is b to be presided

8 0
3 years ago
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Oscilloscope channel addition problem. Read the followingoscilloscope settings carefully. Suppose you display a 1 kHz, 2 Vsine w
Novay_Z [31]

Answer: B.  The trace jumps down 1 division

Explanation:

From the above data, the two signals are combined and adjusted in the middle of the screen. If you switch the signal in channel B from DC to AC, then the screen jumps down 1 division.

4 0
4 years ago
PLEASE HELP!!!!
OLEGan [10]

The story that fits the graph is; he elevator moves up, is stationary for a while, then moves down at a slower rate.

<h3>What is a position time graph?</h3>

The term position time graph shows us how the position of the object is changing with time. The position in this case has to do with the exact point in space where the object can be found. We have here an elevator that could be found at various points.

We now have to turn to the graph and see how the graph can be able to give a description of the motion of the elevator. If we look at the position time graph, it tends to move up and then remain at a point for some time before it moves down.

Based on the analysis that we have made above, we can now look out for any of the stories that fits the description that we have just made here.

Learn more about position time graph:brainly.com/question/13693087

#SPJ1

6 0
1 year ago
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