A truck pulls a trailer at a constant velocity for 100 m while exerting a force of 480 N. Calculate the work done.

Beatrice and the Elevator Beatrice, a middle school student, is visiting a very tall office building and notices that she feels

ahrayia [7]

Explanation:

The question is not complete, here is the complete question

"Beatrice and the Elevator Beatrice, a middle school student, is visiting a very tall office building and notices that she feels heavier when the elevator car is traveling up and lighter when the elevator car is traveling down. After making these observations, Beatrice comes back to the building and stands on a bathroom scale that measures her weight as she travels up and down in the elevator.

1. . What question is Beatrice trying to answer?

2. What is one variable Beatrice could change in her investigation? What might she figure out if this

variable was changed"

1. Beatrice is trying to observe the influence of the elevator movement on her weight, Hence the question is "will the elevator movement cause her weight to change"

therefore moving upward the reading on the scale will increase

Reading=mg+ma

downward

Reading will reduce

Reading=mg-ma

2. The independent variable is the acceleration due to gravity g=9.81m/s^2

while the dependent variables are

i. The elevators acceleration

ii. Beatrice's mass

6 0

3 years ago

A ball is thrown into the air with an upward velocity of 32 feet per second. Its height, h, in feet after t

LekaFEV [45]

Differentiate the expression, to obtain expression for velocity. Set velocity to 0, this when max height is reached. Obtain the tmax from that expression.

h(t) = –16t² + 32t + 6
h'(t) = –32t² + 32
0 = –32t² + 32
t max= 1

hmax = –16(1)² + 32(1) + 6
hmax = 22

Therefore, first option is the correct answer.

8 0

3 years ago

Read 2 more answers

The gas within a cylinder of an engine undergoes a net change in volume of 1.50 × 10-3 m3 when it does work at a constant press

Lemur [1.5K]

Answer:

work =p×v =3.27×10^5×1.5×10^-3 =490.5 joule

efficiency =w/q in

:. qin= w/efficiency =490.5/0.225=2180 joule

qout =q in - work =1689.5 joule

q out is work given as heat

4 0

4 years ago

Help!!!!!!!!! Attached question QUICK WILL GIVE BRAINLIEST

Setler79 [48]

The answer is C.. because angles at north start from 0..

4 0

3 years ago

What is the magnitude of the force required to stretch a 20 cm-long spring, with a spring constant of 100 N/m, to a length of 21

GalinKa [24]

The correct answer to the question is: 1 N.

EXPLANATION:

As per the question, the spring constant or the force constant of the spring is given as k = 100 N/m.

The original length of the spring L = 20 cm.

The stretched length of the spring L'= 21 cm.

Hence, the change in length will be-

∆L = L' - L

= 21 cm - 20 cm

= 1 cm

= 0.01 m

We are asked to calculate the magnitude of force acting on the spring .

From Hooke's law, we know that the restoring force that acts on the spring is proportional to the distance .

Mathematically it can be written as -

F = - kx.

Here, k is the force constant.

x is the change in length due to compression or elongation.

The negative sign is due to the fact that it is opposite to the applied force.

Hence, the applied force on the spring is calculated as -

F = kx

= k × ∆L

= 100 N/ m × 0.01 m

= 1 N.

Hence, the force acting on the spring is 1 N.

8 0

4 years ago