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Consider a uranium nucleus to be a sphere of radius R = 7.4 × 10-15 m with a charge of 92e distributed uniformly throughout its volume. (a) What is the electric force exerted on an electron wh
A 2.0µF capacitor and a 4.0µF capacitor are connected in series across 1000 V. The charged capacitors are then disconnected from the source and connected to each other with terminals of
A child starts from rest at the top of a 2m frictionless water slide. The child leaves the slide horizontally at the bottom 0.5m above the water. At what horizontal distance X from the bottom of the
A box is released from rest on a frictionless ramp at a vertical height of 2m. At the bottom of the ramp the horizontal surface has a coefficient of kinetic friction of .04. At what distance D along
A car of mass 1500 kg is travelling at 30km/hr along a level icy road when the motorist enters a curve (unbanked) of radius 10m. The coefficient of friction between the tires and the road is 0.05.
A string with linear mass density of 0.141 kg/m is under a tension of 103 N. How much power must be supplied to the string to generate a sinusoidal wave of amplitude 1.69 cm and frequency 117 Hz?
An 8.4 kg crate is pulled 4.8 m up a 30° incline by a rope angled 18° above the incline. The tension in the rope is 125 N, and the crate's coefficient of kinetic friction on the incline is
A resistor connected across an AC power supply has a current given by I=(1.05 A)cos{(300t)} when connected to a power supply with emf 120 V rms. A) Find the rms current. B) Find the resistance.
A sample of serum has a mass of 54 mg and a volume of 225 cm^3. What is its density in g/cm^3? What would be the mass of 150 fluid ounces of this serum? What would be the volume of 1 pound of this s
A generator has a 170-turn square coil, 4 cm on a side. A) Find the peak emf in this coil when it's rotating at 105 Hz in Earth's field, B = 5 x 10^-5 T.
Compare (a) the distance traveled during the time of application of the forces,(b) velocities at the end of the time periods, and (c) accelerations at the end of the time periods in the two cases. F
A 2800 kg space vehicle, initially at rest, falls vertically from a height of 3000 km above the Earth's surface. Determine how much work is done by the force of gravity in bringing the vehicle to the
A 40 N horizontal force pushes on a 4.0 kg mass resting on a horizontal surface. The surface exerts a friction force of 24 N against the motion. The acceleration of the 4.0 kg mass is ____ m/s^2.
Neglecting gravity, estimate the average force of air resistance during a pitch, if the distance between the plate and the pitcher is about 15m .
What should be the spring constant k of a spring designed to bring a 1300kg car to rest from a speed of 95 km/h so that the occupants undergo a maximum acceleration of 5.0g?
What is the y-component of the magnetic force on the first particle due to the second?
A projectile spends a total of 20 seconds in the air. It reaches a peak height of 8 meters. How long does it take to reach its peak height? The projectile has a range of 80 meters. What is its horiz
A 2.0-kg object has a velocity of 4.0 i m/s at t = 0. A constant resultant force of (2.0 i+ 4.0 j) N then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of t
A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30? from its initial direction of moti
A truck moving at 80mi/hr passes a police car moving 100mi/hr headed in the opposite direction. If the frequency of the siren relative to the polive car is 500 Hz, what is the frequency heard by an
A car approaches a stationary police car at 80mi/hr. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he app
A steady wind of 25 knots over a very long fetch can create waves of 3-meter height, a period of approximately 10 seconds, and a speed of 16m/s. A steady wind of 40 knots can create waves of 6-meter
A gondola can carry 20 skiers, with a total mass of up to 1760kg . The gondola ascends at a constant speed from the base of a mountain, at 2450 m, to the summit at 3910 m. How much work does the mot
When cylinder-head bolts in an automobile engine are tightened, the critical quantity is the torque applied to the bolts. Why is the torque more important than the actual force applied to the wrench
An earthquake emits both S waves and P waves which travel at different speeds through the Earth. A P wave travel 9000 m/sec and an S wave travels at 5000 m/sec. If P waves are received at a seismic