Question

A freight train has a mass of 1.0 ✕ 107 kg. If the locomotive can exert a constant pull of 7.0 ✕ 105 N, how long does it take to increase the speed of the train from rest to 70 km/h?

Answer #1

Find the speed [km/h] at which Superman
(mass=85 kg) must fly into a train (mass = 19000 kg) traveling at
77 km/hr to stop it?
A: 1.38×104
B: 1.72×104
C: 2.15×104
D: 2.69×104
E: 3.36×104
Tries 0/1
Running into the train at that speed would severely damage both
train and passengers.
Calculate the minimum time [s] Superman must take
to stop the train, if the passengers experience an average
acceleration of -0.44*g (g = 10
m/s2)?
A: 1.59
B: 2.31...

A large cruise ship of mass 6.00 ✕ 107 kg has a speed
of 12.8 m/s at some instant.
(a) What is the ship's kinetic energy at this time?
J
(b) How much work is required to stop it? (Give the work done on
the ship. Include the sign of the value in your answer.)
J
(c) What is the magnitude of the constant force required to stop it
as it undergoes a displacement of 3.90 km?
N

A runaway train car that has a mass of 11,000 kg travels at a
speed of 4.5 m/s down a track. Compute the time (in s) required for
a force of 1000 N to bring the car to rest.
I got 45 m/s but my homework is saying I got it wrong.

A 0.294 kg mass slides on a frictionless floor with a speed of
1.25 m/s. The mass strikes and compresses a spring with a force
constant of 42.2 N/m. How far does the mass travel after contacting
the spring before it comes to rest? How long does it take for the
spring to stop the mass?

A large cruise ship of mass 6.00 ✕ 107 kg has a speed of 10.2
m/s at some instant.
(a) What is the ship's kinetic energy at this time?
______J
(b) How much work is required to stop it? (Give the work done on
the ship. Include the sign of the value in your answer.)
______J
(c) What is the magnitude of the constant force required to stop
it as it undergoes a displacement of 3.60 km?
______N

15. A satellite in Earth orbit has a mass of 107 kg and is at an
altitude of 1.91 106 m. (Assume that U = 0 as
r → ∞.)
(a) What is the potential energy of the satellite–Earth
system?
(b) What is the magnitude of the gravitational force exerted by
the Earth on the satellite?
(c) What force, if any, does the satellite exert on the Earth?
(Enter the magnitude of the force, if there is no force enter...

Boeing 767-400ER model airplane has two engines. Each
engine can have a maximum thrust (mechanical force) output
of 270 kN. When the plane is cruising at 717.25 km/h, the pilot
decides to increase the speed to the typical 850.0 km/h. If drag on
the plane is on average 26188 N, and the engines are engaged at
55.42 % of their maximum thrust output, and the plane weighs 149375
kg, how long does it take to reach the new cruising speed?...

Initially, the monkey is standing on the floor and the bananas
are hanging above his head near the pulley. The monkey’s mass is 2
kg and the mass of the bananas is 4 kg. The pull is 12 cm in
diameter and has a mass of 2.0 kg. As the pulley turns, friction at
the axle exerts a constant torque of magnitude 0.50 N. If the
bananas and the monkey are released from rest with the bananas 1.0
m off...

1- You can find your own mass in
kg with the following information: 1.0 kg weighs about 2.2 lb. on
Earth. a) What is your mass in kg? b) What is your weight in
newtons?
2- Gunter the weightlifter can
lift a 230.0-kg barbell overhead on Earth. The acceleration due to
gravity on the sun is 274 m/s2. a) Would the barbells be heavier on
the sun or on Earth? b) How much (in newtons) would the barbells
weigh on...

An airboat with mass 4.38 102 kg, including the passenger, has
an engine that produces a net horizontal force of 8.12 102 N, after
accounting for forces of resistance.
(a) Find the acceleration of the airboat. ____________m/s^2
(b) Starting from rest, how long does it take the airboat to
reach a speed of 16.5 m/s?_______________s
(c) After reaching that speed, the pilot turns off the engine
and drifts to a stop over a distance of 50.0 meters. Find the
resistance...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 27 minutes ago

asked 31 minutes ago

asked 43 minutes ago

asked 51 minutes ago

asked 1 hour ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 4 hours ago

asked 4 hours ago