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siniylev [52]
4 years ago
6

A dart is thrown horizontally with an initial speed of 10 m/s toward point P, the bull's-eye on a dart board. It hits at point Q

on the rim, vertically below P, 0.19 s later.
(a) What is the distance ?
(b) How far away from the dart board is the dart released?
Physics
1 answer:
Kryger [21]4 years ago
3 0
D=s(t) so it would be d=10(.19) d=.19 FOR BITH SNDWERS
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A student who weighs 500 newtons climbed the stairs from the first floor to the third floor,15 meters above, in 20 seconds. How
igor_vitrenko [27]
Well, the 20 seconds gives us enough information to actually calculate the power she has on her feet :)
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5 0
3 years ago
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The deck of a bridge is suspended 235 feet above a river. If a pebble falls off the side of the bridge, the height, in feet, of
Aleks04 [339]

Answer:

(a) 1, average velocity = -65.6 m/s

   2, average velocity = -64.8 m/s

   3, average velocity = -64.16 m/s

(b) The instantaneous velocity is -96 m/s

Explanation:

(a)

Average velocity is given  by;

y(t_2,t_1) = \frac{y(t_2) - y(t_1)}{t_2-t_1}

(1)

y(2.1,2) = \frac{(235-16*2.1^2) - (235-16*2^2)}{2.1-2}\\\\ y(2.1,2) = -65.6 \ m/s

(2)

y(2.05,2) = \frac{(235-16*2.05^2) - (235-16*2^2)}{2.05-2}\\\\ y(2.05,2) = -64.8 \ m/s

(3)

y(2.01,2) = \frac{(235-16*2.01^2) - (235-16*2^2)}{2.01-2}\\\\ y(2.01,2) = -64.16 \ m/s

b. y = 235 - 16t²

The instantaneous velocity is given by;

v = dy /dt

dy / dt = -32t

when t = 3 s

v = -32(3)

v = -96 m/s

5 0
3 years ago
two forces are acting on a wheelbarrow. One force is pushing to the right and an equal force is pushing to the left. What can yo
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3 0
3 years ago
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(1) Develop an equation that relates the rms voltage of a sine wave to its peak-to-peak voltage. a. If a sine wave has a peak-to
Aleks04 [339]

Answer:

(A) Equation will be v=v_msin\omega t=0.75sin(18840t)

(B) RMS value of voltage will be 0.530 volt

Explanation:

We have given peak to peak voltage of ac wave = 1.5 volt

Peak to peak voltage of ac wave is equal to 2 times of peak voltage

So 2v_{peak}=1.5volt

v_{peak}=\frac{1.5}{2}=0.75volt

Frequency of ac wave is given f = 3 kHz

So angular frequency \omega =2\pi f = 2×3.14×3000 = 18840 rad/sec

So expression of equation will be v=v_msin\omega t=0.75sin(18840t) ( As phase difference is 0 )

Now we have to find the rms value of voltage

So rms voltage will be equal to v_{rms}=\frac{v_{peak}}{\sqrt{2}}=\frac{0.75}{1.414}=0.530volt

4 0
3 years ago
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The north arrow of the compasses will all point to the south since opposite poles attract. I have put an example picture below.

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3 years ago
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