Frequency of the wave is 2 per second
Explanation:
- Frequency is the number of times waves pass at a particular point of time. Here, given time period = 3 s and number of waves that pass in 3 seconds = 6. Find the frequency of the wave per second.
- Frequency is given by the formula
f = 1/T, where f is the frequency and T is the time period
- For 3 seconds, frequency is 6
3 seconds ⇒ 6 waves
⇒ 1 second = 6/3 = 2 waves per second
The answer is B) i am 100% positive
One kilogram equals 1000 grams
Answer:
a) W = 25.872 J
b) - 35.28 J
c) - 9.408
Explanation:
a) The amount of work done by the force of gravity on the ball = Change in potential energy between the two vertical points = - mg (H₂ - H₁)
F = - mg (gravity is acting downwards)
F = - 0.6 × 9.8 = - 5.88 N
(H₂ - H₁) = (1.6 - 6) = - 4.4 m
W = (-5.88)(-4.4) = 25.872 J
b) Gravitational-potential energy of the ball when it was released relative to the ground = (- mg) H₁ = (- 0.6 × 9.8) × 6 = - 35.28 J
c) Gravitational-potential energy of the ball when it is caught relative to the ground = (-mg)(H₂) = -0.6 × 9.8 × 1.6 = - 9.408 J
Your moving air in a vacuum cleaner, there is no central "vaccum". a series of fans move air, the moving air pushes the dirt until it is caught by a filter medium which the air is small enough to get through but the dirt is not. The air is then expelled from the device.
I guess you could use pistons to move the air as well, but either way your compressing air not pulling air away.