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If the initial temperature of the horseshoe is 450° C, and the initial temperature of the water is 45° C, what is the equilibrium temperature of the system? Assume no heat is exchanged with
A negative charge of -2.0 10-4 C and a positive charge of 9.0 10-4 C are separated by 0.26 m. What is the force between the two charges?
If 20 grams of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? How much ice must melt in order t
(a) Draw a freebody diagram for the ladder. (b) Find the normal force exerted by the bottom ladder. (c) Find the tension in the rope when the monkey is two-thirds of the way up the ladder.
A jar of salsa sits on a wheel that is turning at 24 rpm (revolutions per minute). If the jar sits 40 cm from the center of the wheel, what is the acceleration of the jar?
A beam of parallel rays from a 31 MHz citizen's band radio transmitter passes between two electrically conducting (hence opaque to radio waves) buildings located 47 m apart. What is the angular wid
charges of 2.0 uc, -1.0 uc, and -1.0 uc are located at three corners of a square which is 1.0 m on a side. find the magnitude and direction of the electrical force on the 2.0 uc charge.
When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.21 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 25.0o from the
When people sleep, their metabolic rate is about 2.6 10-4 C/(s · kg). How many Calories does a 83 kg person metabolize while getting a good night's sleep of 9.0 hours?
How long does it take a plane, traveling at a constant speed of 266 m/s, to fly once around a circle whose radius is 2250 m.
A car is driven 225 km west and then 78 km southwest (45 degrees). What is the displacement of the car from the point of origin (magnitude and direction)?
A man weighing 690 and a woman weighing 500 have the same momentum. What is the ratio of the man's kinetic energy to that of the woman ?
A hawk flies in a horizontal arc of radius 12.0 m at a speed of 4.00 m/s, and increases its speed at the rate of 1.20 m/s2. Find the acceleration (and direction) under these conditions.
How much greater is the angular momentum of the Earth orbiting about the sun than the moon orbiting about the Earth? (Set up a ratio of angular momenta using data on the inside back cover. The peri
A 5.0 syringe has an inner diameter of 6.0 , a needle inner diameter of 0.27 , and a plunger pad diameter (where you place your finger) of 1.2 . A nurse uses the syringe to inject medicine into a p
If a person can jump a maximum horizontal distance (by using a 45 degree projection angle) of 3.0m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and
A ball of mass 16.9 g is attached to a cord of length 0.52 m and rotates in a vertical circle. What is the minimum speed the ball must have at the top of the circle so the cord does not become slac
How much energy is necessary to place three charges, each of 2.0 micro Coulomb's, at the corners of an equilateral triangle of side 2.0cm?
A displacement vector is 50.0 m in length and is directed 57.0o east of north. What is the northward component of this vector? What is the eastward component of this vector?
A 21 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. what is the tension in the cables in newtons?
what is the work done by an external force that transports an electron from B to A is closest to ?
A constant net force of 1600 N gives a toy rocket an acceleration of 1.6 m/s2. What is the mass of the rocket?
The perspective provided by Multiple-Concept Example 9 is useful here. The highest barrier that a projectile can clear is 15.6 m, when the projectile is launched at an angle of 23.0 ° above the
An electron starts from rest 78.7cm from a fixed point charge with Q = -0.184uC. How fast will the electron be moving when it is very far away? (Ignore any effects of relativity.)
A box slides down a 31° ramp with an acceleration of 1.25 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.