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3 years ago

If you went up in an elevator to the top of a 50m building then came back down, determine these quantities:

2 answers:

7 0

If you walked into the building with your cup of coffee at 8:00 in the morning, took a ride up and down on the elevator for fun, and then went home, then ...

When you got to the top:

... Your distance covered = 50 meters

... Your displacement since you started = 50 meters up

When you returned to the bottom:

... Your total distance covered = 100 meters

... Your displacement since you started = zero

Fittoniya [83]3 years ago

7 0

Answer:

If you walked into the building with your cup of coffee at 8:00 in the morning, took a ride up and down on the elevator for fun, and then went home, then ...

When you got to the top:

... Your distance covered = 50 meters

... Your displacement since you started = 50 meters up

When you returned to the bottom:

... Your total distance covered = 100 meters

... Your displacement since you started = zero

Explanation:

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Weight = mass * gravity = 60 kg * 3.75 m/s² = 225 N

Option D.

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3 years ago

You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped

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F=mgsinα –F(fr)=

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3 years ago

Consider a copper wire with a diameter of 0.450 mm. If you want to cut a piece of the wire so it has a resistance of 3.25 Ω, how

Arisa [49]

Answer:

30.7m

Explanation:

You can use the following equation:

ρ = R * $\frac{S}{l}$

Where ρ is the resistivity, R is the resistance, S is the Cross-sectional Area and l is the length of the wire.

We issolate l in the equation and solve with the data we have:

l = R * $\frac{S}{p}$ = 3.25 Ω * $\frac{0.25 *\pi * ((0.45/1000)^2}{1.68*10^-8}$

l = 30.7m

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3 years ago

A 25 kg child is bouncing on a trampoline, which can be treated as an ideal spring with spring constant 2900 N/m. If the trampol

White raven [17]

Answer:

Explanation:

Energy store in the compressed trampoline = potential energy of at the maximum height ignoring friction

energy stored in the trampoline = $\frac{1}{2} kx^{2}$ where k is spring constant and x is the distance compressed = 0.5 × 2900 × 0.38² = 209.38 J

209.38 J = 25 × 9.8 × h

h maximum height attain = 209.38 J / ( 25 × 9.8) = 0.855 m

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3 years ago

Relate balanced and unbalanced forces to net forces

alina1380 [7]

Answer:If the forces on an object are balanced, the net force is zero.

Explanation:

If the forces are unbalanced forces, the effects don't cancel each other. Any time the forces acting on an object are unbalanced, the net force is not zero, and the motion of the object changes.

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3 years ago