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3 years ago

Could anyone help me for this question please!! Really emergency!!!

Physics

1 answer:

kodGreya [7K]3 years ago

5 0

16/9 m/s^2
negative 4/3 m/s^2
14 m/s
the last one is too detailed to do in my head while on the bus; sorry

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Which is an example of a screw? Lightbulb,ladder,screwdriver,flag pole

Andrei [34K]

screwdriver :)

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4 years ago

Two objects, A and B, have the same size and shape. Object A is twice as massive as B. The objects are simultaneously dropped fr

Olegator [25]

Answer:

acceleration

Explanation:

it will have a great acceleration

5 0

3 years ago

An 80-kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizontally at 15 m/s . How fast wil

Oksanka [162]

Answer:

vBxf = 0.08625m/s

Explanation:

This is a problem about the momentum conservation law. The total momentum before equals the total momentum after.

$p_f=p_i$

pf: final momentum

pi: initial momentum

The analysis of the momentum conservation is about a horizontal momentum (x axis). When the quarterback jumps straight up, his horizontal momentum is zero. Then, after the quarterback throw the ball the sum of the momentum of both quarterback and ball must be zero.

Then, you have:

$m_Qv_{Qxi}+m_{Bxi}v_{Bxi}=m_Qv_{Qxf}+m_{Bxf}v_{Bxf}$ (1)

mQ: the mass of the quarterback = 80kg

mB: the mass of the football = 0.43kg

(vQx)i: the horizontal velocity of quarterback before throwing the ball = 0m/s

(vBx)i: the horizontal velocity of football before being thrown = 0m/s

(vQx)f: the horizontal velocity of quarterback after throwing the ball = ?

(vBx)f: the horizontal velocity of football after being thrown = 15 m/s

You replace the values of the variables in the equation (1), and you solve for (vBx)f:

$0\ kgm/s=-(80kg)(v_{Bxf})+(0.46kg)(15m/s)\\\\v_{Bxf}=\frac{(0.46kg)(15m/s)}{80kg}=0.08625\frac{m}{s}$

Where you have taken the speed of the quarterback as negative because is in the negative direction of the x axis.

Hence, the speed of the quarterback after he throws the ball is 0.08625m/s

6 0

4 years ago

A plane with a mass of 6,800 kg is moving at a speed of 55.0 m/s. What is the kinetic energy of the plane?

ioda

The kinetic energy of plane is 10285000 J

Kinetic energy is defined as the energy possed by an object in motion. The mathematical representation of kinetic energy is given below:

Where:

KE is the kinetic energy

m is the mass of the object

v is the velocity of the object.

With the above formula, we can obtain kinetic energy of the plane as follow:

Mass (m) = 6800 kg

Velocity (v) = 55.0 m/s

<h3>Kinetic energy (KE) =? </h3>

KE = ½mv²

KE = ½ × 6800 × 55²

KE = 3400 × 3025

Therefore, the kinetic energy of plane is 10285000 J

Learn more: brainly.com/question/24713075

7 0

2 years ago

Read 2 more answers

Which of these objects must have the greatest force acting on it? pls help fast

8_murik_8 [283]

Let's look at Newton's second law

F=ma

Force is directly proportional towards mass

If mass is more force will be more.

Between baseball and bowling ball Bowling ball has higher mass

So it would expert most force

Option D

8 0

2 years ago