a cold metal object is put into a tank of hot water. based on the lumped capacitance model, if the convection heat transfer coefficient were decreased, the time it would take for the object to rise to a given temperature would
a steel ball rolls horizontally off the edge of a tabletop that is 1.0 m high. it strikes the floor at a point 2.0 m horizontally away from the table edge. (neglect air resistance.) how long was the ball in the air?
in an ice show a 43.7 kg skater leaps into the air and is caught by an initially stationary 65.7 kg skater. (a) what is their final velocity assuming negligible friction and that the leaper's original horizontal velocity was 4.02 m/s? 4.02 m/s 2.41 m/s 2.67 m/s 1.61 m/s (b) how much kinetic energy is lost? 197 j
a wire has a length of 4.40 10-2 m and is used to make a circular coil of one turn. there is a current of 2.20 a in the wire. in the presence of a 2.80-t magnetic field, what is the maximum torque that this coil can experience?
an electron moving along the x-axis enters a magnetic field. if the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component a) along the y-axis b) along the z-axis c) along the -y-axis d) along the -z-axis e) all components are zero
0.6 kg ball is attached to a cord and spun in a horizontal circle with a radius of 1.2 m. the maximum tension the cord can withstand is 60 n. what is the maximum speed the ball can attain before the cord breaks
there is a point charge at the center of the cavity. the silver sphere has a charge of 9.00 nc on its outer surface and a charge of -2.00 nc on the surface of the cavity. what is the value of the point charge?
waves on a swimming pool propagate at 0.750 m/s. you splash the water at one end of the pool and observe the wave go to the opposite end, reflect, and return in 30.0 s. how far away is the other end of the pool?
an energy-storage network consists of series-connected 16-mh and 14-mh inductors in parallel with series-connected 24-mh and 14-mh inductors. calculate the equivalent inductance. the equivalent inductance is mh.
a car travels around an unbanked curve at 17 m/s. if the static friction coefficient between the tires and the road is 0.45, what is the minimum radius curve that the car can take at this speed without slipping?
what is the difference in pressure between the small pipe (1 cm diameter) and the large pipe (3 cm diameter), assuming that these two pipes are connected and that they are both horizontal and at the same height?
it is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. knowledge of newton's law of cooling. will a can of soda cool fastest in the coldest part of the refigerator?
true or false? if i connect an inductor to an ac power source, the peak current across the inductor leads the potential drop by pi/2 radians. true
