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From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 9.4 m/s. (a) What is the acceleration (magn
How would the photographer use the polarizing filter to find out the direction of polarization of the light coming from the blue sky? Her only reference is the polarization axis of the filter.
An 81 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 76 cm. What is the speed of the arrow as it leaves the bow?
Iron has a density of 7.87 g/cm3 and the mass of an iron atom is 2.40 x 10-26 Kg. If the atoms are spherical and tightly packed, what is the volume of an iron atom? (Your answer must have correct si
If his downward motion is stopped 3.00 s after he enters the water, what average upward force did the water exert on him?
A plane water wave with a wavelength of 15.4 cm passes through two openings that are 5.00 cm apart. At what horizontal distance from the central maxima will the 1st maxima be found?
The coefficient of static friction between his hands and the book is 0.40. to keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
A car crashes into a wall at 25 m/s and is brought to rest in 0.1 s. Calculate the average force exerted on a 80 kg test dummy by the seat belt.
A motorcycle and a police car are moving toward one another. The police car emits sound with a frequency of 532 and has a speed of 25.5 . The motorcycle has a speed of 12.5. What frequency does the
In other words, all readings will be off by exactly that non-zero reading. Will this affect the accuracy of measuring Rx? Explain. Is there a means of still getting an accurate measurement?
The coefficient of kinetic friction is 0.25. Determine the work done on the box by each of the four forces that act on the box. Be sure to include the proper plus or minus sign for the work done by
The rope is inclined at 20.4° above the horizontal, and the sledge moves a distance of 19.5 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.50
In an earthquake, it is noted that a footbridge oscillated up and down in a one loop (fundamental standing wave) pattern once every 2.8 s. What other possible resonant periods of motion are there fo
A spring with a spring constant of 1.8 × 102 N/m is attached to a 1.8 kg mass and then set in motion. What is the period of the mass-spring system?
Next, you start a backetball rolling with the same initial speed. it keeps rolling form one end of the gym to the other. why does the basketball roll so far? Does friction significanlty affect its m
An old moped drives by a small motor turning a small rubber wheel which is in contact with the rear tire. If the small wheel has a 3 cm radius and accelerates at 805 rad/s, how long does it take fo
a superhero flies 235 m from the top of a tall building at an angle of 20 degrees below the horizontal. what is the horizontal component of the superhero's displacement.
A beam of monochromatic green light is diffracted by a slit of width 0.600 mm. The diffraction pattern forms on a wall 2.06 m beyond the slit. The distance between the positions of zero intensity on
If there are 8.00 x 10^24 charged carriers (i.e. electrons)per m^3, what is the hail voltage generated when 3.40-A flows along the conductor?
A car with a mass of 1.50*10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12.0s. Assume that the force of resistance remains constant at 400.0 N during this time. What is the aver
Kelli weighs 405 N, and she is sitting on a playground swing that hangs 0.43 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. Assume that ai
You place 80 moles of hydrogen gas in a balloon of volume 2.6 m3, and find the pressure to be 1.4 times atmospheric pressure. What is the typical speed of a hydrogen molecule?
A juggler tosses a ball from his right hand to his left hand, which is at the same level as his right hand and .60 m to the side. If the ball reaches a height of .80 m above the level of his hands,
An air-filled parallel plate capacitor with a plate spacing of 1.20 cm has a capacitance of 6.10microF. Calculate the dielectric constant of the inserted material.
A supertanker with the mass of 4.67 × 108 kg is moving with a constant velocity. Its engines generate a forward thrust of 8.71 × 106 N. Determine (a) the magnitude of the resistive force