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1) A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing its speed from zero to 4.89 m/s over a time interval of 0.522 s. What impulse and average force does a 74 kg passenger in the car experience?
2) A figure skater rotates about a vertical axis through her center with both arms and one leg extended. Her rotation rate is 0.451 rev/s. She then pulls her arms and leg in closer to her body and begins to spin at 1.68 rev/s. What is the ratio of her new moment of inertia to her old?
3) A 723-N person stands on a uniform board of weight 282 N and length 6.1 m. The board is supported 1.00 meter in from the left end and 0.500 meters in from the right end. The support force 1.00 meters in from the left end is 683 N.
a) What is the support force 0.500 meters in from the right end?b) How far from the left end of the board is the person standing?
A spherical water drop, 1.20 ?m in diameter, is suspended in calm air owing to a downward-directed atmospheric electric field E = 432 N/C. What is the weight of the drop
Then, recalling that the Doppler equation for electromagnetic waves states that the magnitude of the shift in frequency associated with relative motion between a source and observer is ¦f'- f ¦ = vf / c where f' is the observed frequency emitted b..
A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.2 cm. Use work and energy considerations to find the average frictional force that stops the bullet
A plane flies 500 km east from city A to city B in 45.0 min and then 930 km south from city B to city C in 1.50 h. In magnitude-angle notation, what is the plane's displacement for the total trip
A certain child's near point is 13.5 cm; her far point (with eyes relaxed) is 129 cm. Each eye lens is 2.00 cm from the retina. Among what limits does the power of this lens-cornea combination vary? diopters (lower bound) to diopters (upper bound)
Two objects with masses of 3.80 kg and 5.40 kg are connected by a light string that passes over a frictionless pulley, Determine the distance each object will move in the first second of motion if both objects start from rest
A spherical water drop 3.7 ?m in diameter is suspended in calm air due to a downward-directed atmospheric electric field of magnitude E = 12100 N/C. find the magnitude of the gravitational force on the drop
What happens to water that flows out of a pipe at constant pressure (or constant flow rate), and then enters a restriction in the pipe (goes from a fat pipe to a thin pipe, but the pressure in the fat part of the pipe stays the same:
Two radioactive nuclei A and B are present in equal numbers to begin with. Three days later, there are 2.99 times as many A nuclei as there are B nuclei. The half-life of species B is 2.11 days discover the half-life of species A (in days).
A stone with a mass of 0.80 kg is attached to one end of a string 0.900 m long. The string would break if its tension exceeds 600-N.
A 135 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 18 hours later its activity is 85 mCi. The lowest usable level of activity is 10 mCi. What is the tracer's half-life
The modulus of elasticity for a ceramic material having 5.5 vol % porosity is 319 GPa. Compute the modulus of elasticity (in GPa) for the nonporous material. At what volume fraction porosity will the modulus of elasticity be 278 GPa?
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