PHYSICS HIGH SCHOOL

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has a mass of 0.15kg

Answers

Answer 1

Answer:

Answer:

120

Explanation:

KE = (mv^2)/2

= ((0.15)(40)^2)/2

= ((0.15)(1600))/2

= 240/2

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Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the _______________ that drives the nail into the wood.

Answers

The correct answer for the question that is being presented above is this one: "action force." Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the action force that drives the nail into the wood.

Explanation:

The reaction force is what presents you drive because it acts on you. Newton's Third Law of Motion describes that forces perpetually come in action-reaction pairs. The Third Law states that for every action force, there is an identical and opposite reaction force. The ball exerts an equal and opposite force on the bat.

A Block slides down an incline that makes an angle of 30? with the horizontal direction. The coefficient of kinetic friction between the incline and the block is µk = 0.3i) Determine the acceleration of the block.
ii) The block starts at rest from a height of 8m above the ground. What is the speed of the block when it reaches the bottom of the incline.

Answers

Answer:

Acceleration = 2.35 m/ $s^(2)$

Speed = 8.67 m/s

Explanation:

The coefficient of friction , u =0.3

The angle of incline = 30°

The two forces acting on block are weight and friction.

weight along the incline = mg cos60° = $(mg)/(2)$ = 0.5 mg

Friction along incline = umg cos30° = mg $0.3* (√(3))/(2)$

Friction along incline = 0.26 mg

Net force acting on the weight = (0.5 - 0.26) mg = 0.24 mg

Acceleration = $(net force)/(mass)$ = 0.24 g = 2.35 m/ $s^(2)$

The height of incline = 8 m

Length of the inclined edge = 16 m

$v^(2)=u^(2)+2as$

$v^(2)= 2* 0.24 * 9.8* 16$

v= 8.67 m/s

True or false: the speed of the wave is determined by multiplying the wavelength by the frequency

Answers

Well, that's not the only way to determine the wave's speed, but
multiplying those two quantities will always give you the speed.
Sure enough.

yes, it is true. Multiplying wavelength and frequency gives you the speed

When a net force of 17.0 newtons is applied to a dictionary placed on a frictionless table, it accelerates by 3.75 meters/secondÆ. What is the mass of the book?

Answers

Force = (mass) x (acceleration) (Newton's second law of motion)

Divide both sides of the equation by 'acceleration', and you have

Mass = (force) / (acceleration)

Mass = 17 newtons / 3.75 meters per second-sqrd = 4.533 kilograms (rounded)

Which state of matter is most likely represented in the image?