1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bonufazy [111]
3 years ago
11

Jumping up before the elevator hits. After the cable snaps and the safety system fails, an elevator cab free-falls from a height

of 39.0 m. During the collision at the bottom of the elevator shaft, a 92.0 kg passenger is stopped in 3.00 ms. (Assume that neither the passenger nor the cab rebounds.) What are the magnitudes of the (a) impulse and (b) average force on the passenger during the collision
Physics
1 answer:
kondaur [170]3 years ago
8 0

Answer:

a) impulse = 2.5 × 10³Ns

b) average force on the passenger during the collision = 8.3 × 10⁵ N

Explanation:

Given that

Elevator cab free fall = 39.0m

The passenger = 92kg

Collision time = 3.00ms

The impulse is given by

J = Δp

= m(v_f - v_i)

where m is the mass ,

v(f) is final velocity

v(i) is initial velocity which is equal to 0

from the conservation energy system, the kinectic enegy of the passenger equal the potential energy of the pasenger

\frac{1}{2} mV^2_f = mgh

V_f = \sqrt{2gh} \\ = \sqrt{2 \times 9.8 \times 39  }\\ = 27.65ms\\impulse = 92 \times 27.65\\= 2.5 \times 10^3Ns

J = 2.5 × 10³Ns

b) Average force is given by

F(avg) = J / Δt

F_a_v_g = \frac{2,5 \times 10^3}{3 \times 10 ^-^3} \\8.3 \times 10^5N

average force on the passenger during the collision = 8.3 × 10⁵ N

You might be interested in
describe the motion of a pendulum in terms of kinetic and potential energy when it goes from its highest point to lowest point,
MatroZZZ [7]
When it reaches it's peak, the energy is converted into potential as it slows down, then back to kinetic as it goes back to the lowest point.
4 0
4 years ago
An object of mass 30 kg is in free fall in a vacuum where there is no air resistance. Determine the acceleration of the object.
velikii [3]

Answer:

In free fall, mass is not relevant and there's no air resistance, so the acceleration the object is experimenting will be equal to the gravity exerted. If the object is falling on our planet, the value of gravity is approximately 9.81ms2 .

7 0
3 years ago
A proton is projected into a magnetic field that is directed along the positive x axis. Find the direction of the magnetic force
bulgar [2K]

Te direction of the magnetic force for the velocity of the proton in the

-ve  y direction will be +ve z direction.

As we know that the right-hand rule is based on the relation of magnetic fields and the forces that they exert on moving charges.When a charged particle moves under a magnetic field, it exerts a force on the particle, which is not in the same direction but different than the direction of the magnetic field.Under the right-hand rule,  if we point our pointer finger in the direction of the charged particle is moving and the middle finger is representing the direction of the magnetic field then our thumb depicts the direction of the magnetic force which is exerted on the charged particle.

So,  we are given that the direction of the velocity of the proton is in the negative y direction and the direction of the magnetic field is in the positive x  direction,  so the magnetic force is acting in the positive z direction.

To know  more about the right-hand rule refer to the link brainly.com/question/9750730?referrer=searchResults.

#SPJ4

4 0
2 years ago
Infer the direction of the net force acting on a car as it slows down and turns right.
Kobotan [32]
Net force would be towards the right and back (opposite direction of motion) since it's slowing down (decelerating) and turning right.
6 0
3 years ago
Read 2 more answers
A car travels due east with a speed of 52.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth
serg [7]

Answer:

a) v = 6.43 m/s

b) v = 15.8 m/s

Explanation:

Speed of car = 56 km/h

56 km/h = 14.4 m/s

Angle rain makes on the glass to the vertical = 66°

Thus knowing that the opposite side of the angle is the distance moved by the car, and the adjacent side is the distance traveled by the rain in the same time

both of which are directly proportional to their velocities

Then

tan(66°) = 14.44m/s ÷ x

or x = 14.44/tan(66°)

Which is the vertical raindrop velocity of the relative to earth

v = 6.43 m/s vertically towards earth

For v relative to the car is we have vector sum of both velocities

v = √(14.44^2 + 6.43^2) = 15.8 m/s which is the velocity relative to car

= 15.8 m/s

6 0
3 years ago
Other questions:
  • I need help, please help an object starts from rest at time t=0 and moves in the with constant acceleration. The object travels
    9·1 answer
  • if you look inside the bowl of a shiny metal spoon, your image is upside down. if you look at the outside of the bowl, your imag
    7·1 answer
  • Fossil fuels like gasoline or coal are examples of
    7·1 answer
  • When a cup is placed on a table, which force prevents the cup from falling to the ground? A. gravitational force B. normal force
    8·2 answers
  • How are the variables speed and velocity different? how are they similar
    15·2 answers
  • A 1,000 kg truck initially had a velocity of 9 m/s. A force acts on it for a duration of time. After that force, the truck now h
    7·1 answer
  • The Law of Conservation of Mass states that mass can be destroyed during a chemical change.
    7·1 answer
  • 2. Without changing the mass or height, what else do you think you could do to design a system in which GPE and KE values are mo
    5·1 answer
  • Start from 0 m/s and accelerate at 2m/s? Calculate the speed in m/s after acceleration for 5 seconds.
    11·1 answer
  • the diagram below shows the situation described in the problem. the focal length of the lens is labeled f; the scale on the opti
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!