# Which of the following examples best describe using a lever? A. unscrewing a lid from a jar B. turning a screw with a drill C. pulling a box off the ground with rope D. swinging a baseball bat

## Answers

Answer 1
Answer:

A lever is a rigid bar that pivots, or rotates, on a fixed point. So your answer is D. Swinging a baseball bat.

Answer 2
Answer:

Answer:

this is true

Explanation:

i just took the test with the exact same qeustion

## Related Questions

Which of the following statements is not one of Newton's laws of motion? a. The rate of change of momentum of an object is equal to the net force applied to the object.
b. In the absence of a net force acting on it, an object moves with constant velocity.
c. For any force, there always is an equal and opposite reaction force.
d. What goes up must come down.

### Answers

Answer:

The answer to your question: d.

Explanation:

a. The rate of change of momentum of an object is equal to the net force applied to the object.

This is the second a law of motion, so this answer is incorrect.

b. In the absence of a net force acting on it, an object moves with constant velocity.

This is the first Newton law of motion, so this option is not correct.

c. For any force, there always is an equal and opposite reaction force.

This is the third law of motion, so this is not the right option.

d. What goes up must come down.

Newton said this sentence, but is not part of the law of motion.

As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 4.00 and the total cross-sectional area of the venules is 10.0 cm2 , what is the total cross-sectional area of the capillaries feeding these venules? (b) How many capillaries are involved if their average diameter is 10.0 µm?

### Answers

Answer:

capillaries are 5.09 ×

Explanation:

Given data

area = 10.0 cm2

speed = 4.00

average diameter = 10.0 µm

to find out

total cross-sectional area and How many capillaries

solution

we apply here continuity equation

a1× v1  =a2 ×v2

we know v2 /v1 = a1/a2 that is equal 4

so here a1 will be

= 4 × 10

so a1 is 40 cm²

and capillaries are a1/ area

area = /4 × 10 ² ×

capillaries are = 40 × /   /4 × 10 ² ×

capillaries are 5.09 × [tex]10^{7}

Why is the weight of an object more on earth than on the mood ? A.the mood is a satellite of earth
B. The gravitational pull of the mood is greater than of earth
C. The gravitational pull of earth is greater than that of the moon
D. The objects mass is different on earth and on the moon

### Answers

1. moon* lol
And your answer is C. If objects weigh more one one planet than the other, that planet has stronger gravitational pull.

Describe how inertia affects motion

### Answers

Inertia is the resistance an object has in its state of motion

A spring is stretched from equilibrium to 0.90 m, and the work done on the spring equals 18 J. What is the value of the spring constant? 44 N/m

32 N/m

40 N/m

11 N/m

### Answers

Answer:

Option A

44 N/m

Explanation:

Work, where k is the spring constant and x is the spring extension or compression.

Making k the subject of the formula then

Substituting the figures given where 18 J is W and 0.9m is x then

A house at the bottom of a hill is fed by a full tank of water 5m deep and connected to the house by a pipe that is 110m long at an angle of 58 from the horizontal. a) determine the water gauge pressure at the house

b) how high could the water shoot if it came vertically out of a broken pipe in front of the house?

### Answers

Answer:

a)

b)

Explanation:

Given;

• depth of the water-tank,
• length of the pipe,
• inclination of the pipe from the horizontal,

a)

Now the effective vertical height of the water column from the free surface of the water to the bottom of the pipe at house:

Now the pressure due to effective water head:

where:

density of the liquid, here water

acceleration due to gravity

height of the liquid column

b)

Now the height of water corresponding to this pressure will be the same as the effective water head by the law of conservation of energy.

A motorcyclist accelerates from rest to 10 mi/hr. what is the change in velocity

### Answers

The change in velocity is 10 mi/h (4.47 m/s)

Explanation:

The change in velocity of the motorcyclist is given by

where

v is the final velocity

u is the initial velocity

In this problem, we have

u = 0 (the motorbike starts from rest)

v = 10 mi/h

Therefore, the change in velocity is

And keeping in mind that

1 mile = 1609 m

1 h = 3600 s

We can convert it into m/s:

Learn more about velocity:

brainly.com/question/5248528

#LearnwithBrainly

A car is initially traveling south at a speed of 10.9m/s. The brakes are applied and the car comes to a stop over a distance of 39.2 meters. Find the car's acceleration.

### Answers

Answer:

Explanation:

Since the car is moving in a single direction, we can use the following kinematic equation to find its acceleration :

Where:

is the car's final velocity (we are told it comes to a stop)

is the car's initial velocity

is the car's acceleration

is the distance travelled by the car

Isolating :

Solving the equation with the given data:

Finally, the acceleration is:

Note the negative sign indicates the car was decreasing its velocity before coming to a stop.

What is atomic theory and how has it changed over time?

### Answers

Atomic theory is a scientific theory of the nature of matter. The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. Democritus, a philosopher in ancient Greece, began the search for a description of matter. ... He believed that the smallest possible piece of matter was indivisible.
In chemistry and physics, the atomic theory explains how our understanding of the atom has changed over time. Atoms were once thought to be the smallest pieces of matter. The first idea of the atom came from the Greek philosopher Democritus. Hope I helped!!