Which of the following is the correct definition of conduction? A. the transfer of heat by currents within a liquid or gas B. th
2 answers:
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Answer:
1: 6.18 cm
2: 52.5609 degrees
Explanation:
We have the pendulum speed at the origin, and in that moment, all energy is kinetic, so we can calculate the pendulum energy by:
Ec = 0.5*m*v^2 = 0.5*0.015*1.1^2 = 0.0091 J
Now with that energy, we can calculate the height the pendulum will reach, as in that moment, the kinetic energy is totally converted to gravitational potencial energy:
Eg = m*g*h = 0.0091
0.015 * 9.81 * h = 0.0091
h = 0.0091 / (0.015 * 9.81 ) = 0.0618 m = 6.18 cm
Looking at the image attached, we can see that the pendulum will form a triangle, and one of the cathetus will be the length of the pendulum minus the height it went up, and the hypotenusa will be the pendulum length.
So, we know that the sine of the angle will be the division between the opposite cathetus and the hypotenusa:
sin(angle) = (30-6.18)/30 = 23.82/30 = 0.794 -> angle = 52.5609 degrees
Answer:
16 s
Explanation:
The frequency of a wave is the number of oscillations of the wave per second. It is given by:
where
v is the wave speed
is the wavelength
For the wave in this problem we have
v = 25 m/s
So the frequency is
The period of a wave is the time taken for one complete oscillation, and it is equal to the reciprocal of the frequency:
So the period of this wave is:
Answer:9.51 m/s
Explanation:
Given
Window is 4.35 m above ground
time taken=1.2 s
Let u be the initial velocity of keys
where s=distance traveled
u=initial velocity
t=time taken
g=acceleration due to gravity
(b)velocity of keys just before they were caught
v=u+at
v=-2.26 m/s
Here negative sign indicates downward motion of keys