<u>Answer:
</u>
Average speed, over the first 4.0 s of its motion, of a pebble released from rest off a bridge = 19.6 m/s
<u>Explanation:
</u>
We have equation of motion , , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
In this case the initial velocity of body = 0 m/s, acceleration = 9.8 , we need to calculate displacement when t = 4 seconds.
Substituting
So a distance of 78.4 meter has been traveled by pebble in 4 seconds.
Average speed = 78.4/4 = 19.6 m/s
The airplane engine uses oxygen from the air to keep the engines working. Rockets must carry their oxygen for the engines to operate. Third Law of Motion). Rocket propellants by combustion provide the hot gas es that produce reaction force (thrust) when ejected to the rear.
Answer:
See below ↓
Explanation:
Assuming the motion of a simple pendulum, the time period is given by
- ⇒ T = 2π√(L/g)
- ⇒ T₁/T₂ = √(g₂/g₁)
<u>The values we have</u>
- T₁ = 3 s
- g₁ = 9.79 m/s²
- g₂ = 9.82 m/s²
<u>Solving</u>
- T₂ = T₁/√(g₂/g₁)
- T₂ = 3/√(9.82/9.79)
- T₂ = <u>3.004593 seconds</u>
<u></u>
- This many digits are needed because the acceleration is changed by a very small percentage (roughly 2 decimal places)
- So on taking the square root of the ratio of the gravity due to acceleration (2 values), 4 decimal places will be present at the very least
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M1(mass of wood) = 4 kg
M2(mass of water) = 3 kg
V1(volume of wood) = 2 * V2(volume of water )
Density = mass/volume ======= volume = mass/density
Density of water is 1 kg/m3
V2 = M2/density of water
V2 = 3 kg/m3/1kg/m3
V2 = 3 m3
V1(volume of wood) = 2 * V2
V1 = 2 * 3m3
V1 = 6m3
Density of wood = M1 ( mass of wood)/ V1(volume of wood)
Density of wood = 4 kg/ 6m3 = 2/3 kg/m3
Oki said he would not hood him to go on a bike but i said he would be ok if you don’t have a ride home with you and green one for a