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A 60-kg boy and a 40kg girl use an elastic rope while engaging in a tug-o war on an icy frictionless surface. if the acceleration of the girl towards the boy is 3/0m/s squared determing the magnitud
The magnitude of F is 324 newtons and it points at 114o measured counterclockwise from the positive x-axis. What is the y component (in newtons) of F?
How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on?
A person pushes horizontally with a force of 230 N on a 60 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.35. (a) What is the magnitude of the frictional force?
If 30.0 kcal of heat are supplied to 5.00 102 g of water at 23° C, what is the final temperature of the water?
A 2.8 block of wood sits on a table. A 3.0 bullet, fired horizontally at a speed of 550 , goes completely through the block, emerging at a speed of 180. What is the speed of the block immediately af
A truck travels beneath an airplane that is moving 140 km/h at an angle of 51 degrees to the ground. How fast must the truck travel to stay beneath the airplane? Answer in units of km/h.
What is the size of the gravitational force that Earth exerts on the Moon? What is the size of the gravitational force that the Moon exerts on Earth?
The longest recorded pass in an NFL game traveled 88 yards in the air from the quarterback to the receiver.Assuming that the pass was thrown at the optimal 45 ^circ angle, what was the speed at whi
A curve with a 120 m radius on a level road is banked at the correct angle for a speed of 20 {rm m/s}.If an automobile rounds this curve at 30 {rm m/s}, what is the minimum coefficient of static fri
A baseball is hit with a speed of 30.0 ms-1 at an angle of 40.0 degrees. It land`s on the flat roof of a nearby building with a height of 14m. If the ball was hit when it was 1.4 m above the ground
To get the top spinning, its string is pulled with a tension of 0.30. How long does it take for the top to complete the first five revolutions? The string is long enough that it is wrapped around th
A 4.5kg dog stands on an 18 kg flatboat at distance D=6.1m from the shore. It walks 2.4m along the boat toward shore and the nstops Assuming no friction between the boat and the water, find how far
The loaded cab of an elevator has a mass of 2.8 x 103 kg and moves 223 m up the shaft in 26 s at constant speed. At what average rate does the force from the cable do work on the cab?
If it takes a fish 0.20s to perform evasive action, ? Assume the fish is at the surface of the water.at what minimum height must it spot the pelican to escape
An 83 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 81 cm. What is the speed of the arrow as it leaves the bow?
Use the graphical method to find the magnitude and direction of the third displacement.
An automobile with a mass of 940 kg goes around a curve with a radius of 64m.The coefficient of friction between the tires and the road is 0.700. What is the maximum speed with which the car can go
An elastic cord is 66 cm long when a weight of 57 N hangs from it but is 85 cm long when a weight of 85 N hangs from it. What is the "spring" constant k of this elastic cord?
Two forces are applied to the ring of a force table, one at angle of 20o , and the other at an angle of 80o . Regardless of magnitudes of forces, the equilibrant will be in the:
The pilot of an airplane traveling 180 km/h wants to drop supplies to flood victims isolated on a patch of land 150 m below. The supplies should be dropped how many seconds before the plane is direc
Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magneto encephalography, or MEG, is used to study electrical activity in the brain using this co
This wire forms a one turn loop in the shape of a square and is then connected to a battery that applies a potential difference of 0.200 V. If the loop is placed in a uniform magnetic field of magni
The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a maximum of 88.0 cm, what was the speed of the bullet at impact with the block?