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A vehicle starts from C, goes 50 kilometer in a straight line to D, immediately turns around and returns to C. The time for the first part (C to D) was one hour and for the second part (D to C) was two hours. Find the magnitude of the average velocity of the car for this round trip?
A snow maker at a resort pumps 260 kg of lake water per minute and sprays it into the air above a ski run. how much heat does the snow-making process release each minute
An air-track glider attached to a spring oscillates between the 12.0 cm mark and the 55.0 cm mark on the track. calculate the maximum speed of the glider
A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the1.6 m radius of the balloon. Find the absolute pressure of the helium gas
a series combination of a 14 k resistor and an unknown capacitor is connected to a 11 v battery. one second after the
a series rc circuit has a time constant of 1.0 s. the battery has a voltage of 50 v and the maximum current just after
A sound wave propagates in air at 28°C with frequency 3.20 kHz. It passes through a region where the temperature gradually changes, and then it moves through air at 0°C. (a) What is the speed of the wave at 0°C? (b) What is the wavelength of the wave..
What three experimental observations in the photoelectric effect could not be explained classically and why? How did Einstein resolve these problems? (Be explicit and state which assumptions were new to Einstein.)
A radar signal takes 2.7s to go to the moon and return. How far away was the moon at that time
A stockroom worker pushes a box with a mass 11.2kg on a horizontal surface with a constant speed of 3.50m/s. coefficient of kinetic friction between the box and the surface is 0.20.
A 21.0 g copper ring at 0.000°C has an inner diameter of D = 2.54000 cm. An aluminum sphere at 108.0°C has a diameter of d = 2.54508 cm, What is the mass of the sphere
A uniform hollow ball is released from rest at the top of a hill of height H. Calculate its forward linear speed (in terms of H) at the base of this hill if there is no friction on the hill
A 3.8-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,078oC is placed on top of a 2.4-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC
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