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Q1. A hot-air balloon is rising straight up with a speed of 1.83 m/s. A ballast bag is released from rest relative to the balloon when it is 7.86 m above the ground. How much time elapses before the ballast bag hits the ground?
Q2. An elastic cord is 64 cm long when a weight of 56 N hangs from it and is 69 cm long when a weight of 83 N hangs from it. What is the "spring" constant of this elastic cord?
A uniform electric field, E = -50 N/C, fills a region of space. A partcicle with mass, m = 0.025 kg, bearing charge, q = 1mC, Determine where and when the particle crosses the x-axis
you are helping a friend you estimate it takes a force of 1665.5N to draw everything across the level grass at a constant speed. what is the coefficient of friction between the wood board and grass
Two point charges Q1 = +4.30 nC and Q2 = -2.30 nC are separated by 27.0 cm. What is the potential energy of the pair of charges
A coin 2.1 cm in diameter is held 25 cm from a concave spherical mirror of 28 cm radius of curvature. What is the diameter of the image
A spring of spring constant k = 340 Nm-1 is used to launch a 1.5-kg block along a horizontal surface by compressing the spring by a distance of 18 cm. how far does the block slide
A car is travelling with a velocity of + 88.0 km/h. It accelerates at a constant rate of 20 m/s2. If the acceleration lasts for 5.6s, what is the final velocity of the car.
Choose the correct explanation for why you can determine the maximum load given that theta_min is the minimum angle crane arm can make with the horizontal.
When a potential difference of 166 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 32.0 nC/cm2. What is the spacing between plates.
Find out the frequency of the fourth harmonic if the string is fixed at one end and free at other. (That is, if the free end is attached to a long string of negligible mass.)
A golf ball strikes a hard, smooth floor at an angle of 22.1 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0342 kg, and its speed is 47.5 m/s just before and after striking the floor
A rock of mass 47 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. Determine the magnitude of the acceleration of the rock
A photon with an initial wavelength of 1.150×10-11 m Compton scatters from an electron which is initially at rest. What is the kinetic energy of the scattered electron
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