PHYSICS HIGH SCHOOL

If you throw a ball up with a velocity of 7 m/s, how long will it take for the ball to reach the top of its path?A. 0.11 Seconds
B. 0.41 Seconds
C. 0.71 Seconds
D. 1.01 Seconds

Answers

Answer 1
Answer:

Answer:

c. 0.71 [s]

Explanation:

To solve this problem we must use the following equation of kinematics.

v_(f) =v_(o) -g*t

where:

Vf = final velocity = 0 (because when the ball reaches the top, there is no movement)

Vo = initial velocity = 7 [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time [s]

Note: The negative sign of the equation means that the movement is againts the direction of the gravity acceleration.

0 = 7 - (9.81*t)\nt = 0.713 [s]

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Ski lift carry people along 150 m cable up the side of a mountain. Riders are lifted a total of 75 m in elevation. What is the ideal mechanical advantage of the ski lift?

Answers

Ideal Mechanical Advantage (IMA) can be found by using the formula:

IMA = ID/OD

ID = Input Distance

OD = Output Distance

In the question, we are given:

ID = 150

OD = 75

Now, solve the expression with what we have.

IMA = 150/75

IMA = 2

Therefore, the IMA is 2.

Best of Luck!

Select all the factors listed that influence the density of ocean water.a. tides
b. salinity
c. fecundity
d. temperature E. wave height F. current speed

Answers

Answer: b and d

Explanation:

I don’t really have an explanation I just took the test and this was the answer good luck

1) The _________ would be considered a mid-range club? (hint: golf clubs)2) The strength of the golfer, the form of the golfer, the wind, and the ________ affect the distance the gulf ball will travel.
A. age of the golfer
B. temperature
C. course conditions
D. height of the golfer

Answers

C. course conditions
If the grass is grown then the golf ball will not be able to able to cover good ground distance

The TaylorMade M3 Irons are to be considered a mid-range club and is one of the best of 2018.

The strength of the golfer, the form of the golfer, the wind, and the course conditions affect the distance the gulf ball will travel.

Course conditions are really important for a golfer as the grass on the course can determine a lot how the ball moves about after its first bounce.

The heavier the grass and course conditions the lesser the ball travels and vice versa obviously. Same goes if the conditions are damp or not.

Humidity can be measured using human _____.

Answers

can be measured by using humans hair
It says on a website that humidity can be measured by human hair.

Greyhounds can accelerate at 7 m/s2 at the start of a race. How much force does it take a 35 kg dog to produce this acceleration

Answers


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

Force = (35 kg) x (7 m/s²)  =  245 newtons

                                    (about  55 pounds)

If 20 beats are produced within one second, which of the following frequencies could possibly be held by two sound waves traveling through a medium along a common path at the same time? A. 38 Hz and 63 Hz
B. 22 Hz and 42 Hz
C. 47 Hz and 55 Hz
D. 18 Hz and 26 Hz

Answers

Answer:

B. 22 Hz and 42 Hz

Explanation:

The beat is an interference pattern which occurs when two waves of slightly different frequencies meet each other. The beat is heard as a periodic variation, whose frequency (called beat frequency) is equal to the absolute value of the difference between the frequencies of the individual waves:

f_B = |f_1-f_2|

In this problem, we are told that 20 beats per second are produced, so the beat frequency is

f_B = 20 s^(-1) = 20 Hz

Therefore, we must find the two waves which have a difference in frequency equal to this value, 20 Hz. Let's see each choice:

A. 38 Hz and 63 Hz  --> f_B = |38 Hz-63 Hz|=25 Hz --> NO

B. 22 Hz and 42 Hz  --> f_B = |22 Hz-42 Hz|=20 Hz --> YES

C. 47 Hz and 55 Hz  --> f_B = |47 Hz-55 Hz|=8 Hz --> NO

D. 18 Hz and 26 Hz --> f_B = |18 Hz-26 Hz|=8 Hz --> NO

So, the correct choice is

B. 22 Hz and 42 Hz


The right answer for the question that is being asked and shown above is that: "B. 22 Hz and 42 Hz." If 20 beats are produced within one second, the frequencies that could possibly be held by two sound waves traveling through a medium along a common path at the same time is B. 22 Hz and 42 Hz 
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