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What layer of skin causes dandruff? Is this the same layer that peels off after a sunburn? How do you know?
Wrinkles occur with age due to a loss of elasticity and collagen. Which layer of skin do you believe is most responsible? Do you think topical ointments that claim to firm skin really work? Explain why or why not?
A truck travels 40 meter in 8.5 second, while uniformly slowing down to a final speed of 2.8 m/s. Compute the original speed of the truck
A golfer, driving a golf ball off the tee, gives the ball a velocity of +31 m/s. The mass of the ball is 0.045 kg, and the duration of the impact with the golf club is 3.45 10-3 s.
An airplane have airspeed of 162 km/h and an apparent heading due south. If a 45.0 km/h wind blows from the southeast, then find the ground speed of the airplane and its heading
Yellow-green light of wavelength 550 nm in air is incident on the surface of a flat piece of crown glass at an angle of 60. What is the angle of refraction of the light
A projectile with mass of 372 kg is launched straight up from the Earth's surface with an initial speed vi. What magnitude of vi enables the projectile to just reach a maximum height of 5.6RE, measured from the center of the Earth? Ignore air fric..
A lunch tray is being held in one hand, as the figure illustrates. The mass of the tray itself is 0.214 kg, and its center of gravity is located at its geometrical center. Obtain the force exerted by the thumb
A physical pendulum is constructed using a 2.35kg object having a moment of inertia of 27 kg-m2 aboutits center of mass. The rotation (suspension) point is 850.3 cmfrom the center of mass. What is the period of this physical pendulum?
A marble is thrown horizontally with a speed of 13 m/s from the top of a building. From what height above the ground was the marble thrown
Pilot wants to fly an airplane due north, but there's a 65km/h wind blowing towrd teh east. (a) In what direction should the pilot head the plane if its speed relative to the air is 340km/h?(b) draw a vector diagram to illustrate it.
near earth the density of protons in the solar wind a stream of particles from the sun is 8.10 cm-3 and their speed is
The model airplane in Figure 5.7 is flying at a speed of 14.4 m/s on a horizontal circle of radius 17.2 m. What is the net work done on the plane
What exactly is the work function of a metal? Is it the jolt of energy required to obtain any electron out? The maximum jolt of energy needed to obtain an electron out? The minimum jolt ? Something else?
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