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ValentinkaMS [17]
3 years ago
11

Determine the amount of potential energy of a 5 newton book that is moved to three different shelves on a bookcase. The height o

f each shelf is 1.0 meter, 1.5 meters, and 2.0 meters.
Physics
1 answer:
BigorU [14]3 years ago
5 0
Gravitational Potential Energy = weight x height

for 1 meter:

GPE = 5 x 1
 = <u>5N</u>

for 1.5 metres:

GPE = 5 x 1.5
 = <u>7.5N</u>

for 2 metres:

GPE = 5 x 2
 = <u>10N</u>
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A bullet (m=20g) shot with a speed of 800 m/s hits an oak tree and sticks 4cm inside it.
Tcecarenko [31]

Hi there!

We can begin by converting cm to m:

4cm = 0.04 m

Use the following equation:

vf² = vi² + 2ad

The final velocity is 0 m/s, so:

0 = vi² + 2ad

vi² = -2(a)d

Plug in given values to solve for the acceleration:

800²/2(0.04) = -a

a = -8,000,000 m/s²

Find the force using the equation:

F = ma

F = (0.02)(-8,000,000) = -160,000 N

6 0
2 years ago
In terms of impulse and momentum, why are air bags in automobiles a good idea
Inga [223]
During a car crash, the car decelerates extremely rapidly, so inertia causes you to move forward quickly. If there wasn't an airbag to slow you down, you might fly out the windshield.
The air bag increases impulse by increasing the time during which a force acts on you (impulse=force*time). This decreases your forward momentum, so you'll have a better chance of surviving.
5 0
3 years ago
An object that has a mass of 36.0kg is pushed along a horizontal surface with a force of 85.0N. IF
Oksana_A [137]

Answer:

0.36m/s^2

Explanation:

a=f/m

7 0
3 years ago
Sam is observing the velocity of a car at different times. After two hours, the velocity of the car is 54 km/h. After four hours
MariettaO [177]
With that information you can only suppose a uniformly accelerated motion.  This is, acceleration is constant.

Then, acceleration = change in velocity / change in time = (58 -54)km/h / 2 h = 4km/h / 2 h = 2 km/h^2

Then the equation for velocity, V is

V = Vo + a*t = Vo + 2 (km/h^2)  * t = Vo +  2t

Vo is the initial velocity, which you can find using V = 54km/h and t = -2

Vo = V after 2 hours - a*(2hours) = 54km/h - 2(km/h^2)*2h = 54km/k - 4km/h = 50km/h

Then, the equation is: V = 50 km/h + 2t

Valid for constant acceleration. 
5 0
3 years ago
A helium nucleus contains two protons and two neutrons. The mass of the helium nucleus is greater than the combined masses of tw
dsp73

Answer:

False

Explanation:

Actually, the converse is true. The mass number would be lower than the sum of the mass of the individual nucleons combined. According to Einstein’s equation of E=MC², this will be due to a phenomenon called mass defect. This ‘anomaly’ is due to the loss of some energy (now the nuclear binding energy) when the nucleons were brought in together to form the nucleus.

8 0
3 years ago
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