Physics Kinematics Level: Misc Level
You are in a motorboat that moves at 40 km/hr in still water.How long will it take you to travel 15 km upsttream in a river flowing at 6 km/hr.
Physics Kinematics Level: Misc Level
A jet fighter plane is launched from a catapult on an aircraft carrier.It reaches a speed of 32 m/s at the end of the catapult, and this requires 3.0 seconds. Assuming the acceleration is constant, what is the length of the catapult?
Physics Kinematics Level: Misc Level
After touching down on a runway, an airplane is brought to a stop in 15 seconds. If the acceleration of the plane was a cotant -6.5 m/s2, what was the speed of the plane at touchdown?
Physics Force & Laws Of Motion Level: Misc Level
If a person wanted to drag a 40 kg table across a floor the feet having a coefficient friction of 0.7, how much force does the person need to exert to start the table sliding and why is the table easier to drag if the person lifts the end of the table slightly so that two legs are off the floor?
Physics Kinematics Level: Misc Level
A package sitting on a shlef 2 m high is knocked off, calculate the velocity of the box when it hits the floor, using a displacement /velocity/acceleration equation, and conservation of energy.
Physics Circular Motion Level: Misc Level
A person with a ponytail 25 cm long, is using a lathe which is turning at 300 rpm. The person turns their head, catching the end of the ponytail in the workpiece, which has a diameter of 7 cm. How long will it take the person,s head to be dragged into the lathe?
Physics Force & Laws Of Motion Level: Misc Level
Use the concepts of acceleration, force and yield strength to explain why delicate goods shipped in a cardboard box are often first packed in or polyurethane foam?
Physics Force & Laws Of Motion Level: Misc Level
A material has a breaking stress of 700 MNm-2. what mass could be hung from a cable of this material if the diameter of the cable was 4mm?
Physics Modern Physics Level: Misc Level
The K^0 particle decays according to equation K^0-> pi+ pi-.If a particular K^0 decyas while it is at rest in a laboratory, what are the kinetic energies of each of the two pions?( The rest mass of the K^0 is 497.7 MeV/c^2.)
Physics Current Electricity Level: Misc Level
A transformer has 384 primary turns and 1.32 E3 secondary turns. The input voltage is 1.20 E2 V and the output current is 15.0 A.what is the output voltage? what is the input current?
Physics Current Electricity Level: Misc Level
A transformer is designed to change 1.20 E2 V into 1.00 E4 V,and there are 119 turns in the primary coil. How many turns are in the secondary coil? Answer 100% efficiency.turns
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A simple generator has a 360-loop square coil 15.0 cm on a side. How fast must it turn in a 0.750-T field to produce a 125-V peak output? rev/s
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A simple generator has a 360-loop square coil 15.0 cm on a side. How fast must it turn in a 0.750-T field to produce a 125-V peak output? rev/s
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A 510-turn solenoid, 13 cm long, has a diameter of 2.1 cm . A 9-turn coil is wound tightly around the center of the solenoid.If the current in the solenoid increases uniformly from 0.0 to 6.0 A in 0.80 s, what will be the induced emf in the short coil during this time?
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A 13.4-cm -diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.93 T pointing up.During the course of 0.23 s, the field is changed to one of 0.15 T pointing down. what is the average induced emf in the coil?
