Complete question:
Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: use 1000 kg/m³ as density of water)
Answer:
The pressure exerted by the waterbed is 2940 N/m²
Explanation:
Given;
Length of waterbed, L = 2 m
Width of waterbed, W = 2 m
Height of waterbed, H = 30 cm = 0.3 m
density of water, ρ = 1000 kg/m³
Hydrostatic pressure derivation:

The hydrostatic pressure exerted by the waterbed is directly proportional to the height of the waterbed. Thus, the hydrostatic pressure increases with increase in height of the waterbed.
Hydrostatic Pressure exerted by the waterbed:
P = ρgH
P = 1000 x 9.8 x 0.3
P = 2940 N/m²
Therefore, the pressure exerted by the waterbed is 2940 N/m²
(a) The mechanical advantage of the ramp is determined as 2.5.
(b) The pulley provides additional advantage since it assisted the boy in pulling up the load.
<h3>
What is mechanical advantage?</h3>
The mechanical advantage of an object is the ratio of output force to input force, hence it is called force ratio.
<h3>Mechanical advantage of the ramp</h3>
M.A = Lp/h
where;
- Lp is the length of the inclined plane
- h is height of the inclined plane
M.A = 10/4
M.A = 2.5
Learn more about mechanical advantage here: brainly.com/question/25984831
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Answer:
Only 3 is true: The truck exerts the same amount of force on the car as the car exerts on the truck.
Explanation:
Compare the forces if the light truck is standing still when the car hits it.
1. The car exerts a greater amount of force on the truck than the truck exerts on the car. FALSE. This violates Newton 3rd Law of Action-Reaction.
2. The truck exerts a greater amount of force on the car than the car exerts on the truck. FALSE. This violates Newton 3rd Law of Action-Reaction.
3. The truck exerts the same amount of force on the car as the car exerts on the truck. TRUE. This is Newton 3rd Law of Action-Reaction. When there is a contact between objects, both exert on the other an equal and opposite force.
4. None of the answers correctly describes the situation. FALSE. 4 is true.
5. Neither exerts a force on the other. FALSE. If the car hits it then forces must come into play.
200 miles/420 secs = 10/21
350 mile/280 secs = 5/4
(5/4+10/21)/2= 145/168 miles per sec
or .86 miles/sec
Answer:
Explanation:
height, h = 125 miles = 125 x 1609 m = 201125 m = 0.2 x 10^6 m
Rdaius, R = 2.44 x 10^6 m
Mass, M = 3.3 x 10^23 kg
Let vo be the orbital speed.
The formula for the orbital speed is given by

where, M is the mass of mercury, R be the radius of mercury

vo = 2887.47 m/s
Time period, T = 2π(R+h) / vo
T = 2 x 3.14 x 2.64 x 10^6 / 2887.47
T = 5741.77 seconds
T = 1.6 hours