Answer:
Explanation:
Given
time taken to complete the circle=7.9 s
radius of circle(r)=15 m
velocity of rider is given by
Let us suppose T is the tension in the chain and is the angle which chain makes with vertical
Therefore
--2
Divide 1 & 2 we get
Explanation:
the answer is object with more mass have more kinetic energy
K/E=(1/2)mv²
it cant be the last option because it was stated in the question that the velocity is the same
The Cause of Refraction. We have learned that refraction occurs as lightpasses across the boundary between two media. ... The transmission of lightacross a boundary between two media is accompanied by a change in both the speed and wavelength of the wave.
Answer:
a) t = 0.75 s, b) t = 2.25 s
Explanation:
The speed of sound is constant in a material medium
v = 340 m / s
we can use the relations of uniform motion to find the time
v = x / t
t = x / v
In the exercise, the observer's distance to the wall is indicated d = 510 m, it also indicates that the shot is fired at the midpoint
x = d / 2
a) direct sound the distance from the observer to the screen is
x = 510/2 = 255 m
t = 255/340
t = 0.75 s
b) echo sound.
In this case the sound reaches the wall bounces, the distance is
x = d / 2 + d
x = 3/2 d
x = 3/2 510
x = 765 m
the time is
t = x / v
t = 765/340
t = 2.25 s
Answer: The egg will get sucked into the bottle. To get the egg out of the bottle, turn the bottle upside down and blow into it, so that the egg acts as a one-way valve. The increased air pressure in the bottle will cause the egg to pop back out.
Explanation: