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3 years ago

7. Which law describes when a person lands on a

Physics

2 answers:

marissa [1.9K]3 years ago

6 0

Answer:

Newton's Third Law

Explanation:

Newton's third law

Newton's third law: “for every action, there is an equal and opposite reaction.” This is where you get the bounce. When you push down on the trampoline (or fall downward onto the trampoline bed), Newton's third law says that an equal and opposite reaction pushes back.

Anna007 [38]3 years ago

5 0

Answer:

It is Newton's 3rd law

Explanation:

Because: For every action force: (person jumping on a trampoline) there is a equal yet opposite reaction. Reaction force: (The trampoline pushed up against the person's feet.)

Hope this helped!

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A 4500 kg car accelerates from rest to 45.0

Llana [10]

The car undergoes an acceleration a such that

(45.0 km/h)² - 0² = 2 a (90 m)

90 m = 0.09 km, so

(45.0 km/h)² - 0² = 2 a (0.09 km)

Solve for a :

a = (45.0 km/h)² / (2 (0.09 km)) = 11,250 km/h²

Ignoring friction, the net force acting on the car points in the direction of its movement (it's also pulled down by gravity, but the ground pushes back up). Newton's second law then says that the net force F is equal to the mass m times the acceleration a, so that

F = (4500 kg) (11,250 km/h²)

Recall that Newtons (N) are measured as

1 N = 1 kg • m/s²

so we should convert everything accordingly:

11,250 km/h² = (11,250 km/h²) (1000 m/km) (1/3600 h/s)² ≈ 0.868 m/s²

Then the force is

F = (4500 kg) (0.868 m/s²) = 3906.25 N ≈ 3900 N

8 0

4 years ago

A pump lifts water from a lake to a large tank 20 m above the lake. How much work against gravity does the pump do as it transfe

Aleonysh [2.5K]

Answer:

980 kJ

Explanation:

Work = change in energy

W = mgh

W = (1000 kg/m³ × 5.0 m³) (9.8 m/s²) (20 m)

W = 980,000 J

W = 980 kJ

The pump does 980 kJ of work.

3 0

3 years ago

Read 2 more answers

What is the acceleration of an object that starts at rest and reaches 100 m/s in 4 seconds

azamat

Answer:

<h3>The answer is 25 m/s²</h3>

Explanation:

The acceleration of an object given it's velocity and time taken can be found by using the formula

$a = \frac{v}{t}$

where

v is the velocity

t is the time

From the question

v = 100 m/s

t = 4 s

We have

$a = \frac{100}{4} \\$

We have the final answer as

Hope this helps you

7 0

4 years ago

A cinder cone is formed from relatively ________ viscosity magma with a ________ gas content. low; high high; high low; low high

kenny6666 [7]

A cinder cone is formed from relatively low viscosity magma with a high gas content. Cinder cones are formed by the volcanic ash, cinders that are formed around the volcanic vent. Cinder cones have a bowl shaped crater and the shape of the cinder cones depend on the ejected particles that formed the cinder.

5 0

3 years ago

You are holding a shopping basket at the grocery store with two 0.60 kg cartons of cereal at one end of the basket. The basket i

ludmilkaskok [199]

Answer:

The gallon of milk is placed at a distance of 0.641 meters.

Explanation:

We have,

Mass of two 0.6 kg cartons of cereal is 1.2 kg

Length of the basket, l = 0.77 m

Center of the basket is 0.385 m

Mass of the half gallon of milk is 1.8 kg

Total weight in the basket is 1.2 + 1.8 = 3 kg

We need to find the position of the gallon of milk so that the center of mass (COM) of your groceries is at the center of the basket.

So,

(3 × 0.385) = (1.2 × 0) + (1.8 × x)

1.155 = 1.8 x

x = 0.641 meters

So, the gallon of milk is placed at a distance of 0.641 meters.

5 0

4 years ago