PHYSICS HIGH SCHOOL

A baseball bat is a lever. Which of the following explains how a baseball bat differs from a lever like a pry bar?

Answers

Answer 1

Answer:

Complete question is;

A baseball bat is a lever. Which of the following explains how a baseball bat differs from a lever like a pry bar?

A) In a baseball bat, effort force is smaller and is applied over a large distance, while the resistance force is smaller and is applied over a long distance.

B) In a baseball bat, effort force is smaller and is applied over a large distance, while the resistance force is smaller and is applied over a short distance.

C) In a baseball bat, effort force is larger and is applied over a short distance, while the resistance force is smaller and is applied over a long distance.

D) In a baseball bat, effort force is larger and is applied over a short distance, while the resistance force is smaller and is applied over a short distance.

Answer:

C) In a baseball bat, effort force is larger and is applied over a short distance, while the resistance force is smaller and is applied over a long distance.

Explanation:

The correct answer is option C. This is because unlike in a pry bar, the effort force when swinging a baseball bat is larger and it is applied over a short distance; and in return the resisting force is smaller and it's applied over a long distance.

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A material that can easily flow is called aa. fluid.
b. solid.
c. buoyant force.
d. hydraulic material.

Answers

Answer:

a. fluid

Explanation:

A fluid is any body that has the property to flow, and lacks rigidity and elasticity, and consequently yields immediately to any force tending to alter its shape and thus adopting the shape of its container. Fluids can be liquids or gases according to the different intensity of the cohesion forces existing between their molecules. In liquids, intermolecular forces allow particles to move freely, although they maintain latent bonds that cause substances in this state to have a constant or fixed volume. Gases, by contrast, consist of well-separated moving particles that collide with each other and try to disperse, such that the gases have no defined shape or volume.

A material that can easily flow is called a...

A. Fluid.

At the beginning of a basketball game, a referee tosses the ball straight up with a speed of 4.6 m/s. a player cannot touch the ball until after it reaches its maximum height and begins to fall down. what is the minimum time that a player must wait before touching the ball? s

Answers

At the beginning of a basketball game, a referee tosses the ball straight

up with a speed of 4.6 m/s. a player cannot touch the ball until after it reaches its maximum height and begins to fall down. what is the minimum time that a player must wait before touching the ball? s

-----------------------

kinemaic equation

v=u-at

0=4.6-9.81xt

t=4.6/9.81 ... about half a second

The earth has a circumference of about 25000 miles. How is it expressed in scientific notation?

Answers

2.5 * 10^4 miles

Yay!!!

A train starting from a distance of velocity of 90 km.h-1 in 10 minutes assuming that the acceleration is uniform find the acceleration and the distance travelled by the train for attending the velocity

Answers

To make this problem solvable and you can get the help you need, I'll complete and arrange some data.

Answer:

Acceleration: $0.0417\ m/s^2$ , Distance=7,500 m

Explanation:

Uniform Acceleration Motion

It's a type of motion in which the velocity of an object changes uniformly over time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

$v_f=v_o+at\qquad\qquad [1]$

The distance traveled by the object is given by:

$\displaystyle x=v_o.t+(a.t^2)/(2)\qquad\qquad [2]$

Using the equation [1] we can solve for a:

$\displaystyle a=(v_f-v_o)/(t)\qquad\qquad [3]$

The problem will be rewritten as follows:

A train starting from rest reaches a velocity of 90 km/h in 10 minutes. Assuming that the acceleration is uniform, find the acceleration and the distance traveled by the train for attending the velocity.

Let's take the relevant data:

vo=0

vf=90 Km/h*1000/3600 = 25 m/s

t = 10 minutes = 10*60 = 600 seconds

Now compute the acceleration by using [3]:

$\displaystyle a=(25-0)/(600)=0.0417$

$a=0.0417\ m/s^2$

Finally, compute the distance:

$\displaystyle x=0*600+(0.0417\cdot 600^2)/(2)$

$x=7,500\ m$

Note: We used the value of the acceleration with more precision than shown.

Acceleration: $\mathbf{0.0417\ m/s^2}$ , Distance=7,500 m

Which of the following is closest to the speed of sound in air at sea level ?a. 3 m/s
b. 30 m/s
c. 330 m/s
d. 3300 m/s

Answers

Closest to speed of sound in air at sea level : C. 330 m/s I think.

50 J of work was performed in 20 seconds. how much power was used to do this task?

Answers

   Power = (amount of work done) / (time to do the work).

   = (50 J) / (20 sec)

   = 2.5 joule/sec = 2.5 watts .

The Correct answer to this question for Penn Foster Students is: 2.5 W

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