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A "moving sidewalk" in an airport terminal building moves at a speed of V0 and is of length L. A woman steps on at one end and walks at speed V relative to the moving sidewalk.
1. How much time does she need to walk from one end to the other if she walks in the same direction the sidewalk is moving?
2. How much time does she need to walk from one end to the other if she walks opposite to the direction the sidewalk is moving?
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.38 109 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser? (a) the electric fie..
A ball, initially at y = 0, is thrown straight down and takes 1.40 s to move 13.8 m in the - y direction. Calculate the initial velocity of the ball
A spinning flywheel has rotational inertia I = 417 kg·m2. Its angular velocity decreases from 19.5 rad/s to zero in 320 s due to friction. What is the frictional torque acting? Take positive to be "with the flywheel's rotation", and negative to be "o..
At a temperature of 0° C, the mass and volume of a fluid are 798 kg and 1.25 m3. The coefficient of volume expansion is 1.25 10-3(° C)?1. What is the density of the fluid when the temperature has risen to 21.0° C
On an essentially frictionless horizontal ice-skating rink, a skater moving at 3.3 m/s encounters a rough patch that reduces her speed by 41% to a friction force that is 20% of her weight
The pilot of an airplane traveling 190 wants to drop supplies to flood victims isolated on a patch of land 160 below.The supplies should be dropped how many seconds before the plane is directly overhead
A child's water pistol shoots water through a 1.8 mm-diameter hole. If the pistol is fired horizontally 78 cm above the ground, the squirt hits the ground 1.8 m away. What is the volume flow rate through the squirt? Ignore air resistance.
The fastest recorded pitch in Major League Baseball was thrown by Nolan Ryan in 1974. Compute how fast was Ryan's pitch
Calculate the acceptance cone angle for a fiber optic cable that has an index of 1.70 for the fiber core and a 1.47 index for the cladding. What is the acceptance cone angle
The horizontal acceleration of a projectile
Conceptual Example 14 provides useful background for this problem. A playground carousel is free to rotate about its center on frictionless bearings, What is the person's mass
A 60-W incandescent bulb with a tungsten filament is connected to a 120-V power supply. the power dissipated by the cold bulb is
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