Questions and answers by

mssailormouth

Questions (74)

In a laboratory experiment, a calorimeter is used to find the specific heat of an unknown metal. 100.0 grams of dry metal shot
1. 0 answers
2. 1,182 views
We often use a spoon to cool coffee by stirring. Some of the heat is conducted from the coffee to the air by this method, but
1. 0 answers
2. 918 views
How much heat (in joules) is required to boil 250 grams of water that starts at 25C completely to steam? Use 4.2 J/gC for the
1. 0 answers
2. 1,284 views
How so I solve for Torque 2 mass?Torque 1= .125Nm Torque 2= mass? x 9.80 m/s^2 x .253m
1. 4 answers
2. 764 views
How much force must be exerted at the right end to pick up the lever and load if it pivots at the left end? The 2.00 meter long
1. 1 answer
2. 1,069 views
The meter stick has a fulcrum at the 60.0 cm mark. There is 4.0 N at the 20.0 cm mark. The meter stick is uniform and has a
1. 0 answers
2. 994 views
A crowbar is used to pull a nail. The length of the effort arm of the crowbar is 26 cm and the resistance arm is 4.2 cm. What
1. 0 answers
2. 1,285 views
How much force must be exerted at the right end to pick up the lever and load if it pivots at the left end? The 2.00 meter long
1. 0 answers
2. 631 views
The center of gravity of a meter stick that weighs 1.950 N is at the 50.00 cm mark. A 3.54 N weight is suspended from the 20.0
1. 0 answers
2. 1,058 views
A weight of 15 N is located at a distance of 2.5 meters from the fulcrum of a simple lever. At what distance from the fulcrum
1. 4 answers
2. 2,071 views
A force of 25 N is on the end of a 4 meter lever arm turning clockwise. What is the torque?so CW is neg so 25*-4=-100Nm right?
1. 1 answer
2. 1,170 views
A rod has a pivot point on the left end, one force of 6 N up in the middle and one force of 3 N up on the right end. Can the
1. 2 answers
2. 1,858 views
Two people sitting on rolling chairs with little friction push off from each other so that they move apart. On is 60 kg and one
1. 3 answers
2. 2,365 views
A 4 kg block, initially moving due east at 3 m/s, is acted upon by an impulse having magnitude 8 Ns and direction due west. The
1. 1 answer
2. 1,656 views
A truck of mass 4000 kg is at rest, but free to roll with no resistance. If you push it forward with a force of 500 N, the
1. 1 answer
2. 1,727 views
A ball is dropped down to the floor and bounces back up to the same height. (we are assuming a "perfect" ball.) What is the
1. 1 answer
2. 1,652 views
When a baseball bat hits the ball, the impulse delivered to the ball is increased byis it "follow through"??
1. 1 answer
2. 888 views
What is meant by KE being lost to the system in an inelastic collision?
1. 2 answers
2. 416 views
Trying to understand what happens to KE in an inelastic collision. I know it is not conserved. Does that mean it is lost?But if
1. 1 answer
2. 555 views
A 12000 kg train engine moving at 2.2 m/s locks into 3 boxcars with a total mass of 25000 kg sitting still. If the collision is
1. 2 answers
2. 742 views
A 2.0 kg lab car moving to the right with an initial velocity of 3.0 m/s collides with a 1.0 kg lab car moving to the left with
1. 1 answer
2. 1,105 views
In the first step of nuclear fission, a U-235 atom absorbs a neutron and becomes U-236 before becoming unstable and breaking
1. 1 answer
2. 1,606 views
An impulse of 15 Ns acts on a 0.2 kg ball initially at rest. What is the final speed?
1. 1 answer
2. 1,500 views
A ball traveling with an initial momentum of 4.5 kgm/s bounces off a wall and comes back in the opposite direction with a
1. 2 answers
2. 3,131 views
An impulse of 15 Ns acts on a 0.2 kg ball initially at rest. What is the change in momentum?momentum =mV how do I get to V I am
1. 6 answers
2. 2,590 views
A bullet of mass 0.010 kg and speed of 100 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. The
1. 6 answers
2. 4,318 views
What is the formula for NORMAL force?
1. 2 answers
2. 468 views
A projectile is launched horizontally from a height of 2.2 meters at 35 m/s. How far will it travel horizontally before it hits
1. 1 answer
2. 878 views
A 1600 kg car moving at 22 m/s is in a wreck with a 2900 truck moving at 32 m/s in the opposite direction. Which exerts a
1. 1 answer
2. 584 views
A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s.
1. 3 answers
2. 1,797 views
A 10 kg rock that has been dropped from a 60 meter high cliff experiences a average force of air resistance of 30 N. Calculate
1. 2 answers
2. 661 views
In an auditorium, a physics teacher uses a pendulum made by hanging a bowling ball from a wire to the ceiling. At the low point
1. 3 answers
2. 1,755 views
If you double the speed of a car, how much does the kinetic energy increase?How do you know?
1. 1 answer
2. 629 views
A ball is thrown straight up from a bridge at a speed of 11.0 m/s. What will be its velocity (speed and direction) after 2.0
1. 1 answer
2. 1,293 views
Is it possible for a slower moving person to produce a higher horsepower than a faster moving person? If so under what
1. 1 answer
2. 1,944 views
If the speed of a car is doubled, the work to stop the car changes by a factor ofso it's 4....but I cannot think of how I know
1. 1 answer
2. 555 views
An object with a kinetic energy of 50 J is stopped in a distance of 0.01 m. The average force that stops the object is??
1. 2 answers
2. 2,670 views
A 2200 kg car can accelerate from 0 to 30.0 m/s in 5.5 seconds. What is the power required?
1. 4 answers
2. 1,836 views
A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s.
1. 2 answers
2. 511 views
A roller coaster with a mass of 500.0 kg starts from a height of 27.0 meters with a speed of 5.1 m/s. It descends to a height of
1. 1 answer
2. 550 views
A force of F = 125 N is used to drag a crate 3.0 m across a floor. The force is directed at an angle upward from the crate so
1. 2 answers
2. 1,731 views
A 10 kg rock that has been dropped from a 60 meter high cliff experiences a average force of air resistance of 30 N. Calculate
1. 5 answers
2. 1,633 views
A roller coaster with a mass of 500.0 kg starts from a height of 27.0 meters with a speed of 5.1 m/s. It descends to a height of
1. 4 answers
2. 1,352 views
In an auditorium, a physics teacher uses a pendulum made by hanging a bowling ball from a wire to the ceiling. At the low point
1. 2 answers
2. 627 views
A toy "spring gun" has a spring with a spring constant of 30,000 N/m and is depressed 4 cm. It shoots a plastic dart with a mass
1. 5 answers
2. 2,549 views
A basketball player throws a 1.2 kg ball 15 meters into the air. What is the increase in potential energy? What is the work done
1. 1 answer
2. 1,749 views
A 600.0 kg roller coaster is going around vertical loop with a radius of 10.0 meters. The speed of the coaster is 14m/s at the
1. 1 answer
2. 1,202 views
A forensic scientist (CSI) is trying to find a weapon thrown off a bridge into the lake. Assume it is thrown horizontally and it
1. 1 answer
2. 1,196 views
A racecar driver has to hold on tightly when going around a banked curve. How many "gs" does the driver experience in a 2200 kg
1. 1 answer
2. 943 views
A racecar driver has to hold on tightly when going around a banked curve. Approximately what is the centripetal force on a
1. 1 answer
2. 943 views
A golf club head can be thought of as undergoing circular motion when you swing the club. If the club head has a mass of 0.65
1. 1 answer
2. 1,066 views
A baseball is thrown horizontally from a height of 6 meters at a speed of 24 m/s. How far will it travel horizontally before it
1. 3 answers
2. 1,272 views
A 1600 kg car moving at 22 m/s is in a wreck with a 2900 truck moving at 32 m/s in the opposite direction. Which exerts a
1. 1 answer
2. 964 views
A man has a mass of 77.0 kg and is accelerating upward in an elevator at 2.50 m/s2 What is the normal force on his feet in
1. 1 answer
2. 1,528 views
What is the mass of a car that weighs 11,220 N? (The units are kg. Do not include units in the answer and you may round to 3
1. 2 answers
2. 876 views
A water balloon with a mass of 1.20 kg is falling from a roof. If the average force of friction is 0.500 N, what is the
1. 3 answers
2. 1,029 views
An elevator has a mass of 1200.0 kg. It is rising at a steady acceleration DOWNWARD of -3.00 m/s2. What is the tension in the
1. 2 answers
2. 929 views
An elevator has a mass of 1200.0 kg. It is rising at a steady speed of 3.00 m/s. What is the tension in the cable lifting the
1. 4 answers
2. 2,209 views
Three railroad cars are pulled by a train engine at a constant speed. How does the tension pulling the last single car compare
1. 0 answers
2. 836 views
A croquet ball that is hit by a bat keeps rolling horizontally after it leaves the bat because of
1. 2 answers
2. 757 views
An object has a mass of 24.0 kg and is accelerated horizontally at 4.0 m/s2. What is the force required?
1. 2 answers
2. 697 views
Suppose you throw a ball vertically upward with a speed of 49 m/s. Neglecting air friction, what would be the speed of the ball
1. 2 answers
2. 1,171 views
The acceleration due to the Earth's gravity, in English units, is 32 ft/s2. In the absence of air friction, a ball is dropped
1. 3 answers
2. 2,732 views
A car accelerates from 0.0 to 33 m/s in 6.0 seconds. What is the magnitude of the acceleration?I got 198 but the answer is 5.5??
1. 2 answers
2. 1,338 views
A runner can run a 400.0 meter lap in 50.0 seconds. He finishes at the same spot as he began. What is his average velocity?
1. 1 answer
2. 1,047 views
An airplane is flying at 95.0 m/s when the engine is turned off. As it glides, it experiences a force of drag so that is slows
1. 1 answer
2. 1,569 views
A rock dropped from a bridge takes 3.21 seconds to hit the water. How high is the bridge in meters?I need to find Vsub0 to be
1. 8 answers
2. 4,167 views
A car traveling at 22.0 m/s decelerates for 2.33 seconds at a rate of -2.25 m/s2. What will the final speed be in m/s?=16.8m/s??
1. 1 answer
2. 576 views
A car traveling at 22.0 m/s accelerates for 2.37 seconds at a rate of 2.25 m/s2. How far will it travel in meters during this
1. 3 answers
2. 1,938 views
A car moving at 22.0 m/s accelerates at 3.00 m/s2 for 2.39 seconds. What will the final speed be in m/s?do I use v subf= at+v
1. 1 answer
2. 807 views
A runner travels 1.65 km in 5 min and 30 seconds. What is the velocity in m/s? Answer to two decimal places.I think I have
1. 2 answers
2. 1,711 views
A sprinter accelerates at 5.0 m/s2. How far will she travel in 4.0 seconds if she starts at 0 m/s?
1. 4 answers
2. 1,266 views
A ball is thrown straight up from a bridge at a speed of 11.0 m/s. If it takes 5.5 seconds to hit the water below, what is the
1. 2 answers
2. 1,441 views
A ball is thrown straight up from a bridge at a speed of 11.0 m/s. What will be its velocity (speed and direction) after 2.0
1. 4 answers
2. 727 views

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