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The small currents in axons corresponding to nerve impulses produce measurable magnetic fields. A typical axon carries a peak current of 0.040mu*A. What is the strength of the field at a distance o
a circular plate with radius 1.26 m contains 724 μC of a charge uniformly distributed. Find the magnitude of the electric field near the plate.
A cop car drives at 30 m/s toward the scene of a crime, with its siren sounding (f = 2125 Hz.) Calculate the frequency heard by people at the crime scene as the siren approaches and the frequency he
A simple harmonic oscillator consists of a block of mass 3.50 kg attached to a spring of spring constant 210 N/m. When t = 2.30 s, the position and velocity of the block are x = 0.140 m and v = 2.81
Light of wavelength 520 nm is incident normally on a diffraction grating. Determine the total number of primary maxima that can be observed in this situation.
if the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls toward the bottom of the well? (assume rope's mass is negligible, that cylinder turns
A firefighter of mass 89 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him? Answer in units of N.
If the bullet has a mass of 28.0 and a speed of 410 , how high will the block rise after the bullet becomes embedded in it?
A 38.0 ohm resistor is made from a coil of copper wire whose total mass is 11.2 g. Find the length and diameter of the wire.
A string passes over a frictionless pulley and connects a 250 g block to 2.00 kg block. The inclines are frictionless. Assuming you release both masses from rest, how much time will it take the 250
a circuit contains six lamps with 60-W bulbs and a heater connected in parallel. the voltage across the circuit is 120 V. what is the current in the circuit when four lamps are turned on?
Find the heat flow during a time period of 5.00 hours through a glass window, whose thickness is 0.15 in. with an area of 35.00 square feet.
A 20,000 kg railway car stands on a hill with its brakes set. The brakes are released, and the car rolls (without friction) down to the bottom of a hill 9.00 m below its original position. It collid
In the deep ocean, a water wave with wavelength 95 m travels at 12 m/s. Suppose a small boat is at the crest of this wave, 1.0 m above the equilibrium position. What will be the vertical position o
If the heavier fragment lands back at the same point from which the shell was launched, where will the lighter fragment land and how much energy was released in the explosion?
A farm truck moves due north with a constant velocity of 11.00 m/s on a limitless horizontal stretch of road. A boy riding on the back of the truck throws a can of soda upward and catches the projec
It was a rainy day and the coefficient of friction was estimated to be 0.42. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes.
A small but measurable current of 2.11 mA exists in a solid cylindrical wire whose diameter is 0.08 mm. Calculate the magnitude of the current density in the wire.
The pellet is embedded in the skeet. (a) How much higher did the skeet go up? (b) How much extra distance does the skeet travel because of the collision?
A player puches a 250-g hockey puck over frictionless ice with a constant force, causing it to accelerate at 24 m/s^2 over a distance of 50 cm. Find the work done by the hockey player on the puck. W
A 0.90 kg sample of carbon from the wood has an activity of 2060 decays per minute. Find the age of the charcoal.
A puck of mass 80.0 g and radius 4.20 cm slides along an air table at a speed of 1.50 m/s as shown in the figure below. It makes a glancing collision with a second puck of radius 6.00 cm and mass 12
An object 10 cm tall is located on the axis, in the air, 40 cm to the left of the left-hand vertex. find the position and size of the final image.
Two metal rods-one copper, the other lead-are connected in parallel with a temperature of 21° C at one end and 106° C at the other end. Both rods are 0.688 m in length, and the lead rod is 2
Pull horizontally on a crate with a force of 140 N and it slides across the floor in a dynamic equilibrium. How much friction is acting on the crate?