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A car travels east at 95km/h for 0.2hours. It then travels 30.0 degrees east of north at 110km/h for 0.2hours. What is the average speed for the trip?
A conducting wire of circular cross section formed of a material that has a mass density of 2.7 g/cm^3 is placed in a uniform magnetic field with the axis of the wire perpendicular to the direction
A projectile is launched from ground level to the top of a cliff which is 195m away and 155m hight. if the projectile lands on top of the cliff 7.6s after it is fired. Find the initial velocity of t
A particle of ink in an ink-jet printer carries a charge of -8X10^-13 C and is deflected onto paper with a force of 3.2X10^-4 N. Find the strength of the electric field.
A girl with mass m1 and a sled with mass m2 are on the frictionless ice of a frozen lake, a distance d apart but connected by a rope of negligible mass. The girl exerts a horizontal force with magn
The diameter of the base of a cylindrical chimney is 6', its height is 30' and its weight is 1200 lbs. What should be the smallest tie down force that will prevent its toppling in an earthquake whos
A tuning fork having a name plate frequency of 512 hz falls from an over pass as it is struck on the railing a Physics student hears the frequency as 524 hz just as it approaches him below the overp
You are the ground control commander of a 2000 kg scientific rocket that is approaching Mars at a speed of 25,000 km/hr. It needs to quickly slow to 15,000 km/hr to begin a controlled descent to the
A 31.7-kg crate rests on a horizontal floor, and a 70.2-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exert
A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) If the tension in the cord is 91 N, what is the lamp's mass? (b) What is the cord's tension when the el
Four 7.6 kg shperes are located at the corners of a square of side .76 meters. Calculate the magnitude and direction of the total gravitational force exerted on one sphere by the other three.
The toothpick mass was 0.1 g, its speed before entering the branch was 216 m/s, and its penetration depth was 18 mm. If its speed was decreased at a uniform rate, what was the magnitude of the force
The magnetic flux passing through a single loop in a transformer changes at a rate of 9.5 Wb/s. The primary coil has 40 loops and the secondary coil has 862 loops. Find the voltage in each coil.
A mass spectrometer has an adjustable magnetic field. When the magnetic field is 8.000e-2 T, a singly ionized hydrogen atom (a proton) will strike the detector at a particular location.
If the coeficient of kinetic friction is .20, how much work was done by the worker's force? What was the increase in thermal energy of the block-floor system?
Suppose that the synapses are each 98 nm wide; that it takes 0.09 ms for the signal to cross each synapse; and that the action potentials travel at 94 m/s. (a) At what average speed does the signal
A proton is moving at 2.00 × 105 m/s and begins to circle at a radius of 3.500e-3 m. What is the strength of the perpendicular magnetic field acting on the proton?
A particle starts from the origin at t = 0 with a velocity of 6.0 i m/s and moves in the xy plane with a constant acceleration of (-2.0 i + 4.0 j) m/s^2. At the instant the particle achieves its max
A neutron moved through a 8.2 T field with a speed of 198488 m/s. The velocity of the neutron is perpendicular to the field. Determine the magnetic force on the neutron.
A 33 cm diameter coil consists of 20 turns of cylindrical copper wire 3 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 7 x 10-3 T/s. Determine
A proton of rest mass 938.256 MeV/c^2 is moving 75% the speed of light. A. Determine the relativistic mass of the proton?
A current loop in a motor has an area of 0.85 cm2. It carries a 240 mA current in a uniform field of 0.62 T . What is the magnitude of the maximum torque on the current loop?
A boat heads east accross a stream with a velocity of 20.0 m/s. The stream flows from the north at 5.00 m/s. A) What is the resultant velocity of the boat as seen by an observer on the starting bank o
A car of mass 1490 kg traveling at 28 m/s is at the foot of a hill that rises 135m in 2.8km. at the top of the hill, the speed of the car is 6m/s. find the average power delivered by the car's engin