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A speed skater moving across frictionless ice at 10 m/s hits a 5 m wide patch of rough ice. She slows steadily, then continues on at 5.8 m/s. What is her acceleration on the rough ice?
Suppose the speed of light in a vacuum were only 25.0 mi/h. Find the length of a bicycle being ridden at a speed of 20.0 mi/h as measured by an observer sitting on a park bench, given that its prope
What is the time constant of a 9.5 -thick membrane surrounding a 4.0×10-2 diameter spherical cell? Assume the resistivity of the cell membrane as and the dielectric constant is approximately
A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.5 s.
A spotlight on a boat is y = 2.1 m above the water, and the light strikes the water at a point that is x = 7.4 m horizontally displaced from the spotlight (see the drawing). The depth of the water i
a uniform meterstick pivoted at its center has a 100-gram masssuspended at the 25.0 cm position? (a.)at what position should a 75.0 gram mass be suspended to put the system in equilibrium?(b.)what m
A 20 kg chair initially at rest on a horizontal floor requires a 376 N horizontal force to set it in motion. Once the chair is in motion, a 339 N horizontal force keeps it moving at a constant veloc
A roller coaster is towed up an incline at a steady speed of 0.50 m/s by a chain parallel to the surface of the incline. The slope is 3.0 %, which means that the elevation increases by 3.0 m for eve
A beam of parallel rays from a 29 MHz citizen's band radio transmitter passes between two electrically conducting (hence opaque to radio waves) buildings located 45 m apart. What is the angular wid
For a damped oscillator with a mass of 210 g, a spring constant 61 N/m and a damping coefficient of 59 g/s, what is the ratio of the amplitude of the damped oscillations to the initial amplitude at
What is the change in the gravitational potential energy of a Boeing 767 jet as it soars from the runway up to a cruising altitude of 10.2 km? Assume its mass is a constant 2.04×10^5 kg.
A proton moves perpendicularly to a uniform magnetic field B with a speed of 1 × 107 m/s and experiences an acceleration of 4.8 × 1013 m/s2 in the positive x direction when its velocity
A 61 kg skateboarder is moving down a ramp with a 7.0 m radius of curvature. At the bottom of this ramp he reaches a speed of 7.8 m s. What upward force acts on the skateboarder at the bottom of th
What is the tangential acceleration of a bug on the rim of a 11.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 79.0 rev/min in 3.60 s? One second after the bu
Make an order-of-magnitude estimate of the number of revolutions through which a typical automobile tire turns in 1 yr. State the quantities you measure or estimate and their values. (Estimate the
A displacement vector is 53.0 m in length and is directed 33.0o east of north. What is the northward component of this vector? What is the eastward component of this vector?
An object in equilibrium has three forces ex- erted on it. A(n) 31 N force acts at 79.6?, and a(n) 53 N force acts at 57.6?. What is the direction of the third force? (Consider all angles to be mea
The yellow light from a helium discharge tube has a wavelength of 587.5 . When this light illuminates a certain diffraction grating it produces a first-order principal maximum at an angle of 1.050.
Three blocks are arranged in a stack on a frictionless horizontal surface. The bottom block has a mass of 37.0 kg. A block of mass 18.0 kg sits on top of it and a 28.0 kg block sits on top of the m
A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30 . At 10.0 after blastoff, the engines suddenly fail, which means that the force they produce instantly
A firefighter of mass 69 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him?
Carnot engine operated "in reverse" as a heat pump achieves the maximum coefficient of performance. A Carnot heat pump operates to warm a house, where the outside temperature is 12°C and the ins
A penny is placed at the outer edge of a disk (radius = 0.150 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.80 s. Find the mini
Two stationary positive point charges, charge 1 of magnitude 3.10 nC and charge 2 of magnitude 1.74 nC, are separated by a distance of 36.0 cm. An electron is released from rest at the point midway
During one engine cycle, a lawnmower engine does 55.2 J of net work. In the process, it expels 153 J of energy as heat. What is the percent efficiency of the engine?