Get college assignment help at uniessay writers A uniform, 8.00 , spherical shell 55.0 in diameter has four small 1.90 masses attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through the centre of the sphere and two of the small masses .
In a ballistics test, a 25.0g bullet traveling horizontally at 1300m/s goes through a 20.0cm thick 450 kg stationary target and emerges with a speed of 800 m/s. The target is free to slide on a smooth horizontal surface. How long is the bullet in the target?
an airplane flies toward 149 degrees at 525km/h.what is the component of the plane’s velocity towards 90 degrees?
a) If the ultimate shear strength of steel is taken to be 2.80 109 Pa, what force is required to punch through a steel plate 2.00 cm thick? Assume the superhero’s fist has cross-sectional area of 1.00 102 cm2 and is approximately circular.
7.13 A highway curve or radius 500 m is designed for traffic moving at a speed of 90 km/h. What is the correct banking angle of the road? 7.17 A satellite orbiting the moon very near the surface has a period of 110 min. What is the moon”s acceleration due to gravity?
A skier starts from rest and slides down a 20 degree incline 750 m long. If the coefficient of friction is 0.090 on all surfaces, what distance did the skier travel from the base of the incline?
8. A skier starts from rest and slides down a 20 degree incline 750 m long. If the coefficient of friction is 0.090 on all surfaces, what distance did the skier travel from the base of the incline?
A uniform soda can of mass 0.140 kg is 12.0 cm tall and filled with 1.31 kg of soda. Then small holes are drilled in the top and bottom (with negligible loss of metal) to drain the soda. What is the height h of the CM of the can and contents (a) initially and (b) after the can loses all the soda? (c) What happens to h as the soda drains out? (d) If x is the height of the remaining soda at any given instant, find x when the com reaches its lowest point.
A parallel-plate capacitor carries a constant charge Q (i.e., Q on one plate, and -Q on the other). When a dielectric is inserted between the plates, what happens to the voltage difference between the plates, and the potential energy stored in the capacitor? A. The voltage and potential energy both increase. B. The voltage and potential energy both decrease. C. The voltage increases, and the potential energy decreases. D. The voltage decreases, and the potential energy increases. E. None of these choices. A parallel-plate capacitor is attached to a battery that maintains a constant voltage difference ΔV across the plates. When a dielectric is inserted between the plates, what happens to the charge on the plates, and the potential energy stored in the capacitor? The charge and potential energy both increase. The charge increases, and the potential energy decreases. The charge decreases, and the potential energy increases. The charge and potential energy both decrease. None of these choices.
A proton is released from rest in a region of space with a nonzero electric field. As the proton moves, describe what happens to the electric potential energy of the system, and to the electric potential that the proton experiences. The electric potential energy… A. decreases. B. remains constant. C increases. Tries 0/2 As it moves, the proton experiences… A.lower electric potential. B.constant electric potential. C.higher electric potential. Tries 0/2 Repeat the above question starting with an electron at rest. As the electron moves through a nonzero electric field, what happens to the system’s electric potential energy, and to the electric potential experienced by the electron? The electric potential energy… A.decreases. B.remains constant. C.increases. Tries 0/2 As it moves, the electron experiences… A. higher electric potential. B.lower electric potential. C. constant electric potential.
Get college assignment help at uniessay writers A uniform door weighs 46.0 N and is 0.9 m wide and 2.5 m high. What is the magnitude of the torque due to the door’s own weight about a horizontal axis perpendicular to the door and passing through a corner?
A. A 18.8 μF capacitor is fully charged by connecting it to a 16.0 V battery. Calculate the charge stored on one of the capacitor plates. B. This charged capacitor is now disconnected from the battery, and connected to a different capacitor C that is initially uncharged. The resulting final voltage of each capacitor is 3.30 V. Determine the capacitance C.
A 2.00-kg aluminum block and a 6.00-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ = 30.0°) as shown in Figure P4.63. Making use of Table 4.2, determine (a) the acceleration of the two blocks and (b) the tension in the string.
How much work is done to move 2.0 micro coulomb of charge from the negative terminal to the positive terminal of a 2.5 V battery?
A skier is accelerating down a 30.0° hill at a = 3.40 m/s2 (Fig. 3-48). Figure 3-48 (a) What is the vertical component of her acceleration? m/s2 (downward) (b) How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 325 m?
A 39 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.0 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle theta_max = 52^circ. What was v_O
A 240 g air-track glider is attached to a spring. The glider is pushed in 12.0 cm against the spring, then released. A student with a stopwatch finds that 8.0 oscillations take 13.0 s.
a) Twelve equal charges, q, are situated at the corners of a regular 12-sided polygon (for instance, one on each numeral of a clock face). What is the net force on a test charge Q at the center? b) Suppose one of the 12 q’s is removed (the one at “6 o’clock”). What is the force on Q? c) Now 13 equal charges, q, are placed at the corners of a regular 13-sided polygon. What is the force on a test charge Q at the center? d) If one of the 13 q’s is removed, what is the force on Q?
A set of 20 stairs, each of 20 cm height, is ascended by a 700 N man in a period of 1.25 s. Calculate the mechanical work, power, and change in potential energy during the ascent. I have 2800J. Where do I go from here?
The 3.40-kg, 34.0-cm diameter disk in the figure is spinning at 350 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 2.60 seconds?
A piano string of length 1.6 m and mass density 25 mg/m vibrates at a (fundamental) frequency of 450 Hz. (a) What is the speed of the transverse string waves
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