A railroad car moves under a grain elevator at a constant speed of 3.2 m/s. 435...
A railroad car moves under a grain elevator at a constant speed of 3.2 m/s. 435 kg of grain drops into the car reducing its speed to 2.6 m/s. What is the mass of the railroad car?
Homework Answers
Solution :
Given :
Speed of car (vc) = 3.2 m/s
Mass of grain (mg) = 435 kg
Final speed of car + grains (vf) = 2.6 m/s
Let the mass of car be mc.
According to conservation of momentum :
mc vc = (mg + mc)
vf
mc vc = mg vf +
mc vf
mc vc - mc vf =
mg vf
mc ( vc - vf )= mg
vf
mc = mg vf / ( vc -
vf ) = {(435 kg)(2.6 m/s)} / {(3.2 m/s) - (2.6 m/s)}
mc = 1885 kg
Add Answer to:
A railroad car moves under a grain elevator at a constant speed
of 3.2 m/s. 435...
An empty railroad car of mass 4400 kg is being pulled beneath a grain elevator that...
An empty railroad car of mass 4400 kg is being pulled beneath a grain elevator that dumps grain at the rate of 175 kg/s. If the coefficient of friction between the car wheels and the track is 0.021, what is the force needed to keep the car moving at a constant speed of 1.9 m/s 25.0 s after the grain is first dumped on the car Points given for correct answer and explanation
A railroad car (car-A) of mass 3.5X105 kg is traveling at a speed of 0.46 m/s...
A railroad car (car-A) of mass 3.5X105 kg is traveling at a speed of 0.46 m/s and strikes another car (car-B) of mass 8.9X104 kg, which is moving towards car-A with speed 0.25 m/s. If these cars lock together as a result of the collision, what is the common speed (in m/s) after the collision? (a) Before collision (b) After collision 0.2023 1.56 0.316 0.017
A 1000 kg car initially moves at a constant speed of 20 m / s on...
A 1000 kg car initially moves at a constant speed of 20 m / s on a straight road. Its linear momentum is: A) 50 kg m / s B) 100 kg m / s C) 20,000 kg m / s D) 20 kg m / s
A railroad car of mass 2.45* 10^4 kg is moving with a speed of 4.18 m/s....
A railroad car of mass 2.45* 10^4 kg is moving with a speed of 4.18 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.09 m/s.
A 500 kg elevator starts from rest. It moves upward for 2.50 s with constant acceleration...
A 500 kg elevator starts from rest. It moves upward for 2.50 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. a.) What is the average power of the elevator motor during this period? b.) How does this power compare with the motor power when the elevator moves at its cruising speed?
A railroad car of mass 2.42 × 104 kg is moving with a speed of 3.84 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of1.92 m/s.
A railroad car of mass 2.42 × 104 kg is moving with a speed of 3.84 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of1.92 m/s.(a) What is the speed of the four cars after the collision?____ m/s(b) How much mechanical energy is lost in the collision?______J
A 500 kg elevator starts from rest. It moves upward for 3.00 s with constant acceleration...
A 500 kg elevator starts from rest. It moves upward for 3.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. (a) What is the average power of the elevator motor during this period? W (b) How does this power compare with the motor power when the elevator moves at its cruising speed? Pcruising = W
A railroad car of mass 2.30E+4 kg moving with a speed of 3.00 m/s collides and...
A railroad car of mass 2.30E+4 kg moving with a speed of 3.00 m/s collides and couples with two other coupled railroad cars each of the same mass that are already moving in the same direction at a speed of 1.50 m/s. What is the speed (in m/s) of the three coupled cars after the collision? Tries 0/3 How much kinetic energy (in J) is lost in the collision? Tries 0/3
3. A freight car moves along a frictionless level railroad track at constant speed. The car...
3. A freight car moves along a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car? A) It increases. B) It remains the same. C) It decreases D) cannot be determined from the information given
A 639-kg elevator starts from rest and moves upward for 3.40 s with constant acceleration until...
A 639-kg elevator starts from rest and moves upward for 3.40 s with constant acceleration until it reaches its cruising speed, 1.78 m/s. (a) What is the average power of the elevator motor during this period? (b) How does this amount of power compare with its power during an upright trip with constant speed?
A railroad car (car-A) of mass 3.5X105 kg is traveling at a speed of 0.46 m/s and strikes another car (car-B) of mass 8.9X104 kg, which is moving towards car-A with speed 0.25 m/s. If these cars lock together as a result of the collision, what is the common speed (in m/s) after the collision? (a) Before collision (b) After collision 0.2023 1.56 0.316 0.017
3. A freight car moves along a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car? A) It increases. B) It remains the same. C) It decreases D) cannot be determined from the information given
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago