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A skier of mass 68.4 kg glides down a hill of slope 26.5 degree at constant speed. find the coefficient of friction between her skis and the slope
A force F= (6x - 2y)N acts on a particle that undergoes a displacement delta r= (3x + y)m. find the work done by the force on the particle
what is the kinetic energy of a ball of mass 16.1 kg at the apex (highest point) of its trajectory, if it is thrown with an initial speed of 45 mph
A skier of mass m glides down a hill of slope ? at constant speed. If she travels a distance d down the hill, what is the work done by friction
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 23cm apart. What is the wavelength of the sound
The lowest note on a grand piano has a frequency of 27.5 \rm Hz. The entire string is 2.00 \rm m long, What tension is needed to tune this string properly
A charge of 6.53mC is placed at each corner of a square .470 m on a side. Determine the direction of the force on each charge
A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, What was the bear's average velocity
One of the weapons considered for the "Star Wars" antimissile system is a laser that could destroy ballistic missiles. What laser beam intensity will produce such a field
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 deg. above the horizontal
A pump is used to empty a 6000{\rm L} wading pool. The water exits the 2.5-cm-diameter hose at a speed of 2.0{\rm m}/{\rm s}
Water flows at 0.25{\rm L}/{\rm s} through a 12-m-long garden hose 2.0{\rm cm} in diameter that is lying flat on the ground. find the gauge pressure of the water where it enters the hose
NASA's Cassini mission to Saturn released a probe on December 25, 2004, that landed on the Saturnian moon Titan on January 14, How many revolutions had Huygens completed when it was 130 yards from the
A basketball player is standing on the floor 10.0 m from the basket, What is the acceleration of the basketball at the highest point in its trajectory
The mass of a newborn baby's brain has been found to increase by about 1.6 mg per minute. How much does the brain's mass increase in one day
suppose that a projectile which is subject to a linear resistive force is thrown down with a speed of Vyo, Describe and explain how the velocity varies with time, and make a plot of Vy against t
A small glass bead has been charged to + 30{\rm nC}. What is the magnitude of the acceleration of a proton that is 3.0{\rm cm} from the center of the bead
Male mosquitoes in the mood for mating find female mosquitoes of their own species by listening for the characteristic "buzzing" frequency of the female's wing beats. How many wing beats occur in on
A rock is tossed straight up with a speed of 29 m/s. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole
A 0.45kg mass is attached to a spring with a force constant of 21N/m and released from rest a distance of 3.6cm from the equilibrium position of the spring, How far is the mass from the equilibrium
A large plastic block has a net charge of -1.0mC. How many more electrons than protons are in the block
charge q1=1 ?C is located at the position (x,y,)=(5 cm, 7 cm). A second charge, q2=2 ?C is located at the position (x,y,)=(5 cm, 0 cm). Calculate the work required to move a third charge
Suppose 2.5 cubic meter of oil is spilled into the ocean. Find the area of the resulting slick, assuming that it is one molecule thick
By measuring the spectrum of wavelengths of light from our sun, we know that its surface temperature is 5760 K. Use this information to calculate the diameter of our sun
After flying for 15 min in a wind blowing 42 km/h at an angle of 28° south of east, What is the speed of the airplane relative to the air