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A student living in a 4-m X 6-m X 6-m dormitory room turns on her 150-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 10 h later. Use specific heat values at room temperature, and assume the room to be at 100 kPa and 15°C in the morning when she leaves.
Explain how the electric potential energy of a particle can increase
A 100 g bullet is shot into a 1 kg sphere of wood, where it sticks. What is maximum initial speed the projectile can have
A jetliner has a mass of 1.1 x 105 kg and flies at a speed of 120 m/s. what would be the magnitude of the jetliner's momentum
A solenoid is designed to produce a magnetic field of 2.50×10?2T at its center. It has a radius of 1.60cm and a length of 31.0cm , What total length of wire is required
two small plastic spheres are given positive electrical charges. when they are 15.0 cm apart the repulsive force
As part of a safety investigation, two 1900 {rm kg} cars travelling at 19 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 {rm s} to stop, and (b) car that hits a..
A dog running in an open field has components of velocity vx = 2.4m/s and vy = -2.5m/s at time t1 = 11.3s . For the time interval from t1 = 11.3s to t2 = 18.0s , What is the magnitude of the dog's velocity
questionassume that a climber having mass m and who are l tall rappels down a vertical cliff with her body rose at a 43
a lightning bolt with 20000a of current in a circular cross section of radius 5mm strikes the ground 1m from where you
Starting from rest at t = 0 s, a wheel undergoes a constant angular acceleration. When t = 1.7 s, the angular velocity of the wheel is 6.2 rad/s. The acceleration continues until t = 16 s, when the acceleration suddenly changes to 0rad/s2. During wha..
A lightbulb has a resistance of 170 ? when operating with a potential difference of 110 V across it. What is the current in the lightbulb
A parallel capicitor is made of two plates with cross sectional area A which are separated by a distance d, what is the potential difference measured across the plates
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