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Hatshy [7]
3 years ago
15

_____ can be thrown, caught, and used to provide resistance for a variety of movements, in a variety of planes of motion, and at

a variety of velocities.
Physics
1 answer:
FromTheMoon [43]3 years ago
5 0

Answer:

b. Medicine balls

Explanation:

A medicine ball (also called an exercise ball, or a health ball) is a weighted ball about the shoulder diameter (approx. 13.7 inches), often used for recovery and strength training.... In 1705 similar large balls had been used in Persia.So you can use your medicine ball as a projectile to boost the strength of your throws.

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3 years ago
In a car lift used in a service station, compressed air exerts a force on a small piston that has a circular cross section and a
timofeeve [1]

Answer:

a) F₁ = 1.48 x 10³ N

b) P = 1.88*10⁵ Pa

c) The work  is equal in both pistons

Explanation:

Pascal´s Principle can be applied in the hydraulic press:

If we apply a small force (F₁) on a small area piston (A₁), then, a pressure (P) is generated that is transmitted equally to all the particles of the liquid until it reaches a larger area piston and therefore a force (F₂) can be exerted that is proportional to the area(A₂) of the piston.

Pressure is defined as the force per unit area:

P=\frac{F}{A}  Formula (1)

P₁=P₂

\frac{F_{1} }{A_{1} } =\frac{F_{2} }{A_{2} } Formula (2)

Data

r₁= 5 cm = 0.05 m

r₂= 15 cm = 0.15 m

F₂=  13300N

Area of the pistons (A₁,A₂)

A=π*r² : Area of the circle

A₁ = π*(0.05)²=7.85*10⁻³ m²

A₂= π*(0.15)²= 70.69*10⁻³ m²

a) Force that compressed air must exert to lift a car weighing 13300 N

We replace data in the formula (2)

\frac{F_{1} }{A_{1} } =\frac{F_{2} }{A_{2} }

F_{1} = \frac{13300*7.85*10^{-3} }{70.69*10^{-3} }

F₁ =  1.48 x 10³ N

b) Air pressure produced by F₁

We replace data in the formula (1)

P=\frac{F}{A}

F₁ =  1.48 x 10³ N , A₁ = 7.85*10⁻³ m²

P=\frac{1.48*10^{3} }{7.85*10^{-3} }

P= 1.88*10⁵ Pa

c)The volume of liquid displaced by the small piston is distributed in a thin layer on the large piston, so that the product of the force by the displacement (the work) is equal in both pistons.

3 0
3 years ago
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