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A typical adult ear has a surface area of 1.45 × 10-3 m2. The sound intensity during a normal conversation is about 2.49 × 10-6 W/m2 at the listener's ear. Assume that the sound strikes the surface of the ear perpendicularly. How much power is intercepted by the ear?
What must the charge (sign and magnitude) of a 1.46 g particle be for it to remain stationary while placed in a downward-directed electric field of magnitude 690.
Car has the mass M = 1100kg at 60.0 km/hour. What is the radius of the turn if theta = 20.0 degrees
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. What impulse did the athlete receive from the platform
What is the value of acceleration of gravity if a pendulum has a length of 46 cm and the pendulum completes 110 full swing cycles in a time of 132 seconds.
A child in danger of drowning in a river is carried downstream by a current that flows uniformly with a velocity of 2.0 meters per second.
A red laser from the physics lab is marked as producing 632.8-nm light. When light from this laser falls on two closely spaced slits, What is the wavelength of light produced by the pointer
A certain projectile is launched with an initial speed v0. At its highest point its speed is v0 / 4. What was the launch angle
a person pulls on a 50Kg desk with a 200N force acting at 30 angle above the horizontal. the desk does not budge. draw a force diagram for the desk. Write down the equation that describes the forces which act in the x-direction.
Calculate the wavelength of light in vacuum that has a frequency of 6.0 1011 Hz and What is its wavelength in water
A steel cable with total length 20 m and mass 100 kg is connected to two poles. The tension in the cable is 2,000 N, and the wind makes the cable vibrate with a frequency of 2 Hz. compute the wavelength of the resulting wave on the cable.
A 24 rifle bullet travelling 260 buries itself in a 3.10 pendulum hanging on a 2.9 long string, which makes the pendulum swing upward in an arc. Resolve the vertical and horizontal components of the pendulum's displacement.
Determine the tension in each cable if boat has a mass of 490 kg and the angle of each cable is 50 degrees from the horizontal and the boat is being momentarily held at rest. Evaluate this to the tension when the boat is raised and held at rest so th..
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