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A bodybuilder configures a leg-press apparatus to a resistance of 230 lb (about 1000N). She pushes the weight to her full extensionand comes to rest. A). What is her normal force on each of her feet. B). Assume she is able to move the push-plate of theleg-press machine at an acceleration of .50 m/s2 for thefirst half of the displacement. What is the normal force on each foot during this period of acceleration? Assume the resistive forceis due to a weight of 230 lb hanging from the end of the cable.
From street level, Superman spots Lois Lane in trouble-the evil villain, Lex Luthor, Determine how long Superman takes to reach her
A boxcar of mass 5.32 x 10^4 kg is rolling south at 3.49 m/s when it collides and couples with another boxcar that is rolling north at 5.12 m/s. Find the mass of the boxcar
Calculate the acceleration of the system and the tension(s) in the rope. Given m2 = 5Kg, with the friction coefficient of uK =0.4 and uS = 0.5 with the table, wieght m1 = 10Kg and angle = 40 degrees. Draw free body diagram.
The force of the wind on a small sail boat is 500 N northeast (45 degrees N of E). If the drag if the keel is 250 N acting west, what is the acceleration of the boat
Tarzan swings on a 34.0-m-long vine initially inclined at an angle of 31.0° with the vertical, What is his speed at the bottom of the swing if he starts from rest
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.30 x 10^11 m apart. What is the mass of the smaller star
A coil of inductance 110 mH and unknown resistance and a 1.4 ?F capacitor are connected in series with an alternating emf of frequency 980 Hz. what is the resistance of the coil
A 60 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. determine her altitude as she crosses the bar
Once a traffic light turns green, a car speeds up from rest to 50 mi/h with constant acceleration 9 mi/h • s. In the adjoining bike lane, a cyclist speeds up from rest to 20mi/h with constant acceleration 13mi/h.
Assume that the brakes in your car create a constant deceleration, regardless of how fast you are going. If you double your driving speed, how does this affect the time required to come to a stop
A 200KeV electron (i.e., an electron having kinetic energy of 200KeV) collides with a 200KeV positron (a particle with opposite charge of electron but) moving in the opposite direction in a head-on collision.
Light from a helium-neon laser (wavelength=633 nm) is focused through a pinhole prior to illuminating a 1.00 mm diameter aperture. If the pinhole is located 50.0 cm behind the diffracting aperture, how far in front of the aperture should an observ..
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