Answer:
Explanation:
The motion of an object in free fall is a uniformly accelerated motion, so we can analyze it using the following suvat equation:
where, taking downward as positive direction:
s is the vertical displacement
u is the initial velocity
t is the time of flight
g is the acceleration of gravity
For the ball dropped in this problem,
s = 10 m
t = 5.0 s
u = 0
Therefore, solving the equation for g, we find the acceleration due to gravity:
Answer:
800 kg/m³
Explanation:
I assume you want to find the density of the sphere?
Start with a free body diagram. There are three forces acting on the sphere: gravity pulling the sphere down, buoyancy pushing the sphere up, and tension pulling the sphere down.
Applying Newton's second law:
∑F = ma
B - W - T = ma
Since the sphere isn't accelerating, a = 0.
B - W - T = 0
B = W + T
We know that the tension is one-fourth the weight:
B = W + W/4
B = 5/4 W
B = 5/4 mg
Buoyant force is defined as:
B = ρVg,
where ρ is the density of the fluid, V is the displaced volume, and g is acceleration of gravity.
ρVg = 5/4 mg
ρV = 5/4 m
The mass of the sphere is equal to its density times its volume. Since the sphere is fully submerged, it's volume is the same as the volume of the displaced water.
ρV = 5/4 ρₓV
ρ = 5/4 ρₓ
ρₓ = 4/5 ρ
So the density of the sphere is 4/5 the density of the water. Water's density is 1000 kg/m³, so:
ρₓ = 4/5 (1000 kg/m³)
ρₓ = 800 kg/m³
Answer:
1.327363 m/s
0.00090243 m
Explanation:
u = Initial velocity
v = Final velocity
m = Mass of flea
Energy
The velocity of the flea when leaving the ground is 1.327363 m/s
The flea will travel 0.00090243 m upward
You have to inform your coach and get his signature in the fitness log.
Explanation:
Every time you finish your target and complete the task given by your coach, you have to make an entry in the fitness log given.
For the coach to know that you have done the task for the day, you have to get a signature from the coach to show him the evidence that the task given has been completed.
This is the first thing that an individual should do after making an entry in the fitness log.
After that he can plan out the next level work out for the next day and inform his coach of the same.