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A novice skier, starting from rest, slides down a frictionless 33.0° incline whose vertical height is 124 m. How fast is she going when she reaches the bottom?
In a performance test, each of two cars takes 9.0 s to accelerate from rest to 27 m/s. Car A has a mass of 1400 kg, and car B has a mass of 1900 kg. Find the net average force that acts on each car
An elastic cord is 67 cm long when a weight of 58 N hangs from it but is 86 cm long when a weight of 78 N hangs from it. What is the "spring" constant k of this elastic cord?
An 9.00 {rm kg} point mass and a 15.0 {rm kg} point mass are held in place 50.0 {rm cm} apart. A particle of mass m is released from a point between the two masses 19.0 {rm cm} from the 9.00 {rm kg}
Two particles are fixed on an x axis. Particle 1 of charge q1=2.3x10-8 C at x=20.0 cm and particle 2 of charge q2= -4.50q1 at x=70 cm. At what coordinate (i.e., x value) on the axis is the net elect
The surface of the water 2.50 m from the point directly above the flashlight. What angle (in air) does the emerging ray make with the water's surface?
A dog pulls on a pillow with a force of 39 N at an angle of 52° above the horizontal. Find the x and y components of this force.
In the reflections, fully destructive interference occurs at 600 nm and fully constructive interference at 750 nm. Calculate the thickness of the acetone film.
A coin is placed 9.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 36 rpm i
A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 160 m. What is
A person on earth measures that the time between beats is 2.50 s. How fast is the rock star moving relative to the earth?
A 52 kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her alt
Consider an electron on the surface of a uniformly charged sphere of radius 1.5 cm and total charge 1.5 10-15 C. What is the "escape speed" for this electron?
A force of 40.0 N is used to pull a 10.0-kg wooden block at a constant velocity across a smooth glass surface on Earth. what force would be required to pull the same wooden block across the same gla
A layer of transparent plastic (n = 1.59) on glass (n = 1.52) looks dark when viewed in reflected light whose wavelength is 570 nm in vacuum. Find the two smallest possible nonzero values for the t
Describe a procedure to investigate the factors that determine the force of friction between a wooden block and the surface on which it's resting
What is the smallest angle of incidence with respect to the top mirror, such that the laser beam hits the mirrors in each way?
A train moving at a constant speed of 64.0 km/h moves east for 44.0 min, then in a direction 40.0° east of due north for 28.0 min, and then west for 56.0 min. What is the average velocity of the
The rms speed of the molecules in 1.0 of hydrogen gas is 1800 . What is the total translational kinetic energy of the gas molecules?
A rocket moves upward, starting from rest with an acceleration of 29.1 m/s2 for 4.54 s. It runs out of fuel at the end of the 4.54 s but does not stop. How high does rocket rise above the ground?
A 0.4 kg mass attached to a spring is pulled back horizontally across a table so that the potential energy of the system is increased from zero to 195 J. Ignoring friction, what is the kinetic energ
Two strings are adjusted to vibrate at exactly 225 Hz. Then the tension in one string is increased slightly. Afterward, three beats per second are heard when the strings vibrate at the same time. Wh
A 44.0 cm diameter loop is rotated in a uniform electric field until the position of maximum electric flux is found. The flux in this position is 5.40 105 N·m2/C. What is the magnitude of th
A projectile is launched from the edge of a cliff, 100 meters above the canyon floor. The initial horizontal velocity is 85 meters per second. How far from the base of the cliff will it be upon imp
What must the charge (sign and magnitude) of a particle of mass 1.44 be for it to remain stationary when placed in a downward-directed electric field of magnitude 630 ? Use 9.81 for the magnitude o