Answer:
6m/s
Explanation:
- Acclⁿ = 3m/s²
- Displacement = 6m .
- Initial velocity = 0m/s .
- Final velocity = ?
We know that ,
2as = v² - u²
2 * 3m/s² * 6m = v² - (0)²
v² = 36m²/s²
v = √36 m²/s²
v = 6m/s
Answer:
The value of g = 0.6168 m/s².
Explanation:
Given that,
On a planet X,
Length of the pendulum(L) = 0.25 meters,
Time period of the pendulum(T) = 4 seconds.
We have to find the 'g' value on the planet.
The 'g' value on a planet can be found by a pendulum with help of the formula,
T = 2π ×
From this, g = 4π² ×
Using the above formula and substituting the values,we get,
g = 0.6168 m/s².
Answer:
Approximately .
Assumption: air resistance is negligible.
Explanation:
Make sure all the values are in standard units.
.
The bounce here is an inelastic collision between the ball and the surface. Some of the kinetic energy (KE) was lost. The exact value of energy loss would be equal to .
Before the bounce, all the kinetic energy of the ball would come from the drop from . That is:
.
After the bounce, the ball travels to a height of . All the potential energy gained in that process should come from the kinetic energy when the ball bounces back from the ground.
.
Hence, the size of energy loss due to the bounce would be equal to
.
Work done on the crate is 1411.2 J
Explanation:
Work done is defined as the product of force and the distance moved by the object. The unit of work done is in joules and denoted by the symbol J.
Work done = F * d
where F represents the force and d represents the distance moved by the object.
mass = 72 kg , distance moved by the object is given by 2.0 m
Force F = mass * gravity = 72 * 9.8
= 705.6 N =706 N.
Work done = 706 * 2.0 = 1412 J.
Total weight = Volume × density
5) calculate weight of concrete slab by multiplying volume and their density in similar unit as Weight = Volume× density, density= 150lb/ cf, so total weight = 33 cf × 150 lb/cf = 4950 pounds or 2.475 short tons.