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Neglecting gravity, estimate the average force of air resistance during a pitch, if the distance between the plate and the pitcher is about 15m .
At one instant of time the first particle with a charge of 4.20 uC is located at x = 0 and y = +7.40 cm, and the second particle with a charge of 2.00 uC is located at x = 0 and y = -7.40 cm.What i
You throw a ball horizontally off of a building with a horizontal velocity of 5m/s. What is the ball's horizontal velocity 8 seconds later? How high should the building be if you want the ball to fa
As a 2.0-kg object moves from (2 i + 5 j)m to (6 i - 2 j)m, the constant resultant force acting on it is equal to (4 i - 3 j)N. If the speed of the object at the initial position is 4.0 m/s, what is
If the frequency of the siren relative to the polive car is 500 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? (Assume the velocity of sound in a
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
Transverse waves are traveling on a 1 meter long piano string at 500 m/s. If the points of zero vibration occur at one-half wavelength (where the string is fastened at both ends), find the frequency
If P waves are received at a seismic station 1 minute before an S wave arrives, how far to the earthquake center?
Sketch a free-body diagram, labeling the gravitational and normal forces acting on the beam and placing the woman x meters to the right of the first pivot, which is the origin. (Do this on paper. Yo
Water pressurized to 3 * 10^5 pa is flowing at 5 m/sec in a horizontal pipe which contracts to 1/3 its former area. What is the pressure and velocity of the water after the contraction?
If the cards are to blur together into solid blocks of color when viewed by a spectator at the other end of the stadium (140 m away), what is the maximum diameter (in mm) of the spectator's pupils?
A supertaker filled with oil has a total mass of 6 * 10^8 kg. If the dimensions of the ship are those of a rectangular box 300 meters long, 80 meters wide, and 40 meters high, determine how far the
The inner sphere has a net charge of Q1 = 4.70 µC, and the outer spherical shell has a net charge of Q2 = -8.30 µC. What is the surface charge density, sb, on the inner surface of the oute
A U.S. $20 gold piece has a mass of 33.44 grams and displaces 1.935 cm^3 of water. If the coin is known to consist of only gold (Pau = 19.3 g/cm^3) and copper ( Pcu = 8.9 g/cm^3), what is the percen
A 2.00 -long, 480 rope pulls a 6.00 block of ice across a horizontal, frictionless surface. The block accelerates at 2.00 . How much force pulls forward on (a) the ice, (b) the rope?
An electron moves in a circular path perpendicular to a constant magnetic field of magnitude 1.00 mT. The angular momentum of the electron about the center of the circle is 4.00 kg m2/s. Determine (
Two parallel metal plates have area A = 255 cm2 and are separated by l = 0.50cm. They have a potential difference of 0.25 V. Find the numerical value of the electric field. What are the charge densi
An electron moves in a circular path perpendicular to a constant magnetic field of magnitude 1.00 mT. The angular momentum of the electron about the center of the circle is 4.00 m kg m2/s. Determine
The coil is then rotated with an angular speed of 5.00p rad/s. (The plane of the coil is in the yz plane at t = 0.) Determine the emf generated in the coil as a function of time.
The edges of a cube consist of equal resistors of resistance R, which are joined at the corners. Let a battery be connected to two opposite corners of a face of the cube. What is the effective resis
You find yourself on the surface of this asteroid and throw a baseball at a speed of 24 m/s. If the baseball is to travel around the asteroid in a circular orbit, what is the largest radius asteroid
Two identical conducting small spheres are placed with their centers 0.395 m apart. One is given a charge of -12.0 nC and the other a charge of -15.0 nC. (a) Find the electric force exerted by one s