PHYSICS HIGH SCHOOL

1) A force of 28 N stretches a very light idealspring 0.71 m from equilibrium. What is the
force constant (spring constant) of the spring?
A) 39 N/m
B) 22 N/m
C) 46 N/m
D) 31 N/m

Answers

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two truckers are traveling directly away from each other at the same speed. If one trucker sounds her horn at a frequency of 206 Hz, and the other trucker hears a frequency of 189 Hz, determine the speed of the trucks. Use the speed of sound as 343 m/s. m/s

Answers

Answer:

v' = 14.76 m/s

Explanation:

given,

frequency of the one truck = 206 Hz

apparent frequency ,f' = 189 Hz

speed of sound, v = 343 m/s

speed of observer (v_o)and source (v_s) = v'

now, using Doppler's effect

f' = (v-v_o)/(v+v_s)\ f

f' = (v- v')/(v+v')\ f

189 = (343- v')/(343+v')\ 206

0.9174= (343- v')/(343+v')

314.69 + 0.9174 v' = 343 - v'

1.9174 v' = 28.30

v' = 14.76 m/s

hence, the speed of the truck is equal to 14.76 m/s

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:

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]

which unit of measure would scientist use to measure the thickness of rock layer, created as a result of volcanic activity

Answers

A scientist would use a unit of length appropriate for the magnitude of what he or she is measuring. In this case, since rock is built up very slowly, they would probably use millimetres or centimetres. In some cases they may use meters. 

A scientist would use a unit of length appropriate for the magnitude of what he or she is measuring. In this case, since rock is built up very slowly, they would probably use millimetres or centimetres. In some cases they may use meters. 

There you go.

For the above circuit, use superposition to determine the voltage across the R3 resistor due only to the I1 current source. Use the following values for your calculations: I1 = 5 A V1= 16 V R1=3 Ohms, R2=12 Ohms, R3=3 Ohms. Find V.

Answers

Answer:

idk

Explanation:

idk

(x - 4)2 = 36 Which of the following expressions represents the solutions to the given equation?

Answers

X = 22 is what I think.

Which of the following is an example of a measurement of velocity?A. 1 m.
B. 1 m/s.
C. 1 m/s².
D. 1 m/s north.

Answers

Velocity has a unit of m/s [meters per second] and contains both a magnitude and direction. Therefore the answer would be D
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