3 years ago

A kilometer is a measure of an object’s

Physics

1 answer:

Rudiy273 years ago

8 0

I want to say length

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How long must a simple pendulum be if it is to make exactly six swings per second? (that is, one complete vibration takes exactl

MA_775_DIABLO [31]

The period of a simple pendulum is given by:
$T=2 \pi \sqrt{ \frac{L}{g} }$
where L is the length of the pendulum and g is the gravitational acceleration.

The pendulum in our problem makes one complete vibration in 0.333 s, so its period is T=0.333 s. Using this information, we can re-arrange the previous formula to find the length of the pendulum, L:
$L= g \frac{T^2}{(2 \pi)^2}=(9.81 m/s^2) \frac{(0.333 s)^2}{(2 \pi)^2}=0.028 m$

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3 years ago

Show that a light ray that strikes two mutually perpendicular reflecting surfaces is reflected back exactly parallel to the dire

DedPeter [7]

Take a look at the attachment below. As you can see, the figure demonstrates a 90 degree angle such that the surfaces are perpendicular, and hence are independent of the angle of incidence. You could say that this forms a part of a parallelogram -

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3 years ago

What is the net force on an

Shtirlitz [24]

Force=7N-5N

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It is because of difference between direction

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2 years ago

Question 16

julsineya [31]

More mass is the correct answer.

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3 years ago

How long is Tina, a ballerina, in the air when she leaps straight up with a speed of 1.8 m/s?

Vlada [557]

Using first equation of motion;
vf = vi + at --------------------- (1)
where vf = final velocity
vi = initial velocity
a = acceleration (here it is considered to be gravitational acceleration)
t = time

As
vi = 1.8 m/s
vf = 0 m/s
a = g = -9.8 m/s^2 (negative sign is due to the upward motion of tina)

using equation (1),
0 = 1.8 + (-9.8 * t)
t = 9.8/1.8
t = 0.1836 seconds
but the tina has to travel back to the ground, hence the time taken by tina to be in the air will be
t = 2 * 0.1836

t = 0.367 seconds

3 0

3 years ago

Read 2 more answers