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3 years ago

PLEASE HELP IM UNSURE OF WHAT THE ANSWER IS

Physics

1 answer:

katovenus [111]3 years ago

6 0

Answer:

The horizontal forces (Cols 2 & 3) balance for W and Y.

The vertical forces (Cols 1 & 4) also balance for W and Y.

This is not true for either X (unbalanced horizontal forces) or

Z (also unbalnced horizontal forces)

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When spiking a volleyball, a player changes the velocity of the ball from 4.2m/s to -24m/s along a certain direction. If the imp

dedylja [7]

Answer:

The mass of the volleyball is 0.32 kg.

Explanation:

Given that,

Initial speed of the ball, u = 4.2 m/s

Final speed of the ball, v = -24 m/s

The impulse delivered to the ball by the player is -9.3 kg-m/s.

To find,

Mass of the volleyball.

Solution,

The change in momentum of the volleyball is equal to the impulse delivered to the ball. It is given by :

$J=m(v-u)$

$m=\dfrac{J}{(v-u)}$

$m=\dfrac{-9.3\ kg-m/s}{(-24-4.2)\ m/s}$

m = 0.32 kg

So, the mass of the volleyball is 0.32 kg.

5 0

3 years ago

Andy (mass 80.0 kg), Randy (mass 60.0 kg), and twins Candy and Mandy (each with a mass of 70.0 kg) climb into a 1000.-kg car, ca

PolarNik [594]

To solve this problem we will apply the relationship between Newton's second law and Hooke's law, with which we will define the balance of the system. From the only unknown in that equation that will be the constant of the spring, we will proceed to find the period of vibration of the car.

We know from Hooke's law that the force in a spring is defined as

$F = kx$

Here k is the spring constant and x the displacement

While by Newton's second law we have that the Weight can be defined as

$F = mg$

Here m is the mass and g the gravity acceleration.

The total weight would be

$F = (80+60+70)(9.8)$

$F = 2058 N$

Each spring takes a quarter of the weight, then

$F_s = \frac{2058}{4} = 514.5N$

Since the system is in equilibrium the force produced by the weight in each spring must be equivalent to the force of the spring, that is to say

$F_s = F$

$\frac{1}{4} mg = kx$

$514.5N = k(0.04)$

$k = 12862.5kg \cdot m/s^2$

The period of a spring-mass system is given as

$T = 2\pi \sqrt{\frac{M}{4k}}$

The total mass is equivalent as the sum of all the weights, then replacing we have that the Period is

$T = 2\pi \sqrt{\frac{1000+80+60+70}{4( 12862.5)}}$

$T = 0.9635s$

Therefore the period of vibration of the car as it comes to rest after the four get in is 0.9635s

6 0

3 years ago

When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in mome

photoshop1234 [79]

B The change in momentum stays the same because the ball still comes to a stop.

3 0

3 years ago

Read 2 more answers

The 11 th one please! Somebody help me:(

photoshop1234 [79]

Answer:

203360Pa

Explanation:

Pressure= density of liquid*height*g

=1000*10*10

=100000Pa

Total pressure= water pressure + atmospheric pressure

=1000000+103360

=203360 Pascal

5 0

3 years ago

Nuclear winter story. A crazy president is trying to solve the global warming problem and has successfully built a powerful H-bo

Irina18 [472]

Answer:

A nuclear winter is a climatic phenomenon that would follow the detonation of several atomic bombs in the event that a nuclear war broke out. These bombs would cause firestorms that would raise smoke, dust and particles into the atmosphere that would end up in the stratosphere and eventually spread throughout the globe.

Explanation:

That idea is far fetched, because even though those same particles would absorb sunlight, it would raise the temperature in the stratosphere and cause a decrease in temperature in the Earth's layer. Unable to seep the sun's rays, many plant species would die and this would affect the entire food chain.

In addition, that temperature rise in the stratosphere would destroy part of the ozone layer, causing greater exposure to ultraviolet rays. This would end up affecting health and further damaging plant species.

6 0

3 years ago