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a) Two 68 g ice cubes are dropped into 234 g of water in a thermally insulated container. If the water is initially at25°C, and the ice comes directly from a freezer at -15°C, what is the final temperature at thermal equilibrium? (Neglect the heat capacity of the glass.)
b) What is the final temperature if only one ice cube is utilized?
A tight uniform string with a length of 1.80 m is tied down at both ends and placed under a tension of 100 N. What is the mass of the string
The lob in tennis is an effective tatic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net. With what minimum average speed must he move
A disk rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. How many radians does the disk turn through during the 5.0-s interval
Five identical particles of mass m = 0.30 kg are mounted at equalintervals on a thin rod of length script i = 1.05 m and mass M =3.0 kg, with one mass at each end of the rod
A 50 kg projectile is fired over level land at an angle of 30 degrees above the horizontal with a muzzle velocity of 210 m/s. How much energy was released during the explosion
Three equal point charges each with charge 1.45 μC are placed at the vertices of an equilateral triangle whose sides are of length 0.400m. What is the electric potential energy of the system. Take as zero the potential energy of the 3 charges when ..
As a spaceship flies past with speed v, you observe that 1.0000s elapses on the ship's clock in the same time that 1.0000min elapses on Earth. How fast is the ship traveling, relative to the Earth
a cord is used to vertically lower an initially stationary block of mass m 15 kg at a constant downward acceleration
A compass needle in a uniform magnetic field of 0.25 T experiences a torque of 0.030Nm, What is the magnitude of the needle's magnetic moment
An alpha particle, the nucleus of a helium atom, has a mass of 6.7*10-27 kg and a charge of 3.2*10-19C. It floats at rest above a charged horizontal sheet with uniform charge density on its surface.
A flywheel in the form of a uniformly thick disk of radius 1.23 m, has a mass of 45.1 kg, Calculate the constant torque required to stop it in 1.25 min
an object is placed to the left of aa lens and a real image is formed to the right of the lens. the image is inverted relative to the object and is one half the size of the object. how far from the lens is the object
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