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From a cliff that is 9.4 m above a lake, a young woman (mass 44 kg) jumps from rest, straight down into the water. At the instant she strikes the water, what is her de Broglie wavelength?
A 8.0×10-2-{rm kg} toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 m/s in a horizontal circle of radius 0.50 m,
A light string of length 2R is attached to the surface and used to suspend the sphere from the ceiling. Its rotational inertia about the point of attachment at the ceiling is:
An elastic cord is 69 cm long when a weight of 59 N hangs from it but is 90 cm long when a weight of 75 N hangs from it. What is the "spring" constant k of this elastic cord?
If you are 5.00 m away from a lightning strike of 5.00×10^4 A(strikes of that magnitude do occur), what strength of magnetic field do you experience?
(a) How many cubic meters of water per second is this tank losing?
The femoral artery is the large artery that carries blood to the leg. A person's femoral artery has an inner diameter of 1.3 cm. What is the resistance of a 22-cm-long column of blood in this arter
An 76 person stands on a uniform ladder 4.0 long, that weighs 100 , as shown in the figure . The floor is rough; hence, it exerts both a normal force, , and a frictional force, on the ladder. The w
An electric device, which heats water by immersing a resistance wire in the water. What is the resistance of the heater wire?
A soccer ball with a mass of 448 g bounces off the crossbar of a goal and is deflected upward at an angle of 56.2° with respect to horizontal. Immediately after the deflection, the kinetic energ
(a) Estimate the work done by the snow in bringing him to the rest. (b) Estimate the average force exerted on him by the snow to stop him.
the electric field 5.0 cm from a very long charged wire is 2000 N/C and directed toward the wire. What is the sign of the charge on the wire? What is the linear charge density λ on the wire?
A person carries a long pole of mass 14 kg and length 3.0 m at an angle of 60 degrees. Find the magnitude of the torque on the pole due to gravity.
A typical automobile consumes about 70 kW of power from the gas tank. How many 100-watt light bulbs could this light up, if the energy were used to light electric bulbs rather than to run the car?
A uniform electric field of strength E = 334 N/C passes through a flat surface at an angle of 0.866 radians. The electric flux is 455 (N/C)·m2. What is the area of the surface?
A toy train rolls around a horizontal 1.3--diameter track. The coefficient of rolling friction is 0.10. What is the magnitude of the train's angular acceleration after it is released? (found)
A cannonball launched with an initial velocity of 121 m/s at and angle of 35° follows a parabolic path and hits a balloon at the top of its trajectory. Neglecting air resistance, how fast is it
You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip. How much force must you exert to keep the pole motionless in a horizontal position?
If the length of the gun barrel is 0.80 , what is the magnitude of the accelerating force? (Assume the acceleration to be constant.)
Consider a civilization broadcasting a signal with a power of 1.5×104 watts. The Arecibo radio telescope, which is about 300 meters in diameter, could detect this signal if it is coming from a
If a 2m telescope is observing a wavelength of 600nm, what's the smallest resolvable angle in arc seconds?
A 1300 kg car drives around a flat 190 m diameter circular track at 30 m/s. What is the magnitude and direction of the net force on the car?
In determination of the volume of the irregularly shaped objected, any air bubbles sticking to the surface of the object when it submerged caused systematic errors. Will this error give and experime
An ocean liner leaves New York City and travels 33.0° north of east for 297 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship
30 kg car travels at 90 km/h around a curve with a radius of 140 m. What should the banking angle of the curve be so that the only force between the pavement and tires of the car is the normal reac