ࡱ>  l+bjbjqq .Peel#dw4{!BBBB  $"_% !B>BBB !5!B B :,^ 02!8 K!0{! R&H&^ &^ BBBBBBB ! !:HBBB{!BBBB&BBBBBBBBB : Practice Problems for Test I for PHY2020 Solutions in Red Ignore air friction in all problems. 3 sig figs on all answers unless otherwise asked, -1/4 point for not enough sig figs I have given the units for each answer line g=9.8 m/s2 100 cm=1 m 39.37 inches=1 m 1 km=1000 m 12 inches=1 foot 3 feet=1 yard 5280 feet=1 mile = 1.61 km 1 kg = 1000 g 1 min=60 s 1 hour = 60 min G=6.7 10-11 Nm2/kg2 Comparison between metric and English units of Force: 1 lb (pound) = 4.45 N Useful formulas: Formulas: Dont forget d = v t !!!!! (works when no acceleration) x-x0 = v0xt + (1/2)axt2 y-y0 = v0yt + (1/2)ayt2 2ax (x x0) = vx2 v0x2 2ay (y y0) = vy2 v0y2 v = v0 + at F=ma Fgravity = GmM/r2 where r is the distance between the center of the little m and the big M ` G=6.7 10-11 Nm2/kg2 a = v2/r circumference of a circle: 2(r, where r is the radius 1a (1 point). A very fast horse can run 9 furlongs in a total of 1 minute and 46 seconds. 1 furlong= 201 meters. How fast, in units of m/s, is the horse's average speed? ______________ m/s vave=total distance/total time = 9 furlongs * 201 m/furlong / 106 s = 17.1 m/s 1b (1 point). In August, 2009, the world's "fastest human", Usain Bolt, ran the 100 m dash in the record time of 9.58 s. His average speed in m/s is: ________________________m/s v=d/t = 100 m/9.58 s = 10.4 s 1c (1 point). In September, 2008 a world record for the marathon (26 miles and 385 yards long) was set by Haile Gebrselassie of 2 hours 3 minutes and 59 seconds. His average speed in m/s was: _________________________m/s 2 hours = 120 min = 7200 s, so total time is 7200 s + 180 s (for the 3 min) + 59 s = 7439 s. 1 mile=1.6 km, 1 yard = 3 feet, 5280 ft=1 mi, so 1 mi=1760 yards so 385 yards=385/1760 mi = 0.219 mi, so marathon is 26.219 mi long = 26.219 mi * 1600 m/mi = 41950 m, so vave=41950 m/7439 s = 5.64 m/s 2a (1 points). A young child living on the 10th floor (30 m above ground) is tired of having to wash the dishes, so he/she just throws them out the window horizontally with v=6 m/s. Ignoring air resistance, with what horizontal velocity, in m/s, will a dish hit the ground? ______________m/s no friction, no acceleration in the horizontal direction to change the initial velocity, so just 6 m/s - the starting velocity. 2b (1 points). How long does a plate, which started off with no vertical component of velocity, take to hit the ground, is s? _________________s y=height=30 m=1/2 gt2 (no v0y), so t = (2 * 30 m / (9.8 m/s2))1/2 = 2.47 s or, if you want to keep track of the signs, y-yo= -30m = - 1/2 gt2, and t=2.47 s 2c (1 point) What is the vertical component of the plates velocity (get the sign right!) when it hits the ground, in m/s? (Assume the up direction is the +y direction.) ___________________m/s vy = v0y g*t = 0 9.8 m/s2 * 2.47 s = -24.2 m/s (note the minus sign which was -1/4 point if you missed it.) 2d (1 point) What is the total velocity, v, of the plate ( v = (vx2 + vy2)1/2 ) just as it hits the ground? _________________________m/s v=(24.22 m2/s2 + 62 m2/s2)1/2 = 24.9 m/s  2e (2 points) What is the angle ( with respect to the horizontal (see figure) in degrees with which the plate strikes the ground? (Express your angle in the first quadrant, this means give your answer as a positive angle between 0 and 90o) ___________________o vx, which remains unchanged, is 6 m/s. When impact occurs, vy= -24.2 m/s. Making a triangle where the hypotenuse is the total v (24.9 m/s) and the side across from ( is vy and the side adjacent is vx, then tan(= -24.2/6 = -4.03, so (= -76o, or in the first quadrant just 76o. You could also do cos(=6/24.9 or sin( = -24.2/24.9, which give the same answer. 3a. (2 points) If a jet plane is going in a horizontal circular pathway of 2000 m radius, how fast in m/s does the plane have to be going in order for the lateral (sideways) acceleration on the plane/pilot to be 5 g's? (1 g = 9.8 m/s2) _______________________________m/s a=5 g = 49 m/s2 = v2/r where r=2000 m, so v=(49*2000)1/2 m/s = 313 m/s 3b (2 points) If the jet plane now flies at the same speed in a vertical circular pathway of 2000 m radius, how many times his normal weight is the total force on the pilot at the bottom of the pathway just as the plane is starting back upwards (1 sig fig)? ______________times (the answer is some integer) The seat of the aircraft (and the whole plane) at the bottom of the loop has an acceleration vector of 5 g's pointing directly upwards, since anet=v2/r is the circular motion acceleration necessary to turn the plane in the loop at that speed. In addition to the force on the pilot exerted by the seat to make the turn, the pilot is being pulled down into the seat at 1 g due to gravity and the seat (action=reaction) pushes up on the pilot with an additional mpilot*g force to counter the gravity force on the pilot. Thus, the total force on the pilot/total weight of the pilot is 6 times his normal weight. 4a. (2 points) The largest moon of Saturn, named Titan, was discovered in 1655 and orbits at a distance of 1,222,000 km from Saturn. If the mass of Saturn is 5.69 1026 kg, what is the acceleration, in m/s2 due to Saturn's gravity at the radius of Titan? (Which causes Titan to orbit Saturn instead of flying off in a straight line.) ______________________m/s2 FSaturn on Titan = GMSaturnmTitan/(1.222 109 m)2 so just divide both sides by mTitan to get aSaturn at Titan's orbit = 6.7 10-11 5.69 1026 /(1.222 109)2 m/s2 = 25.5 10-3 m/s2 or about 10 times the acceleration on the Moon from the Earth that we calculated in class. One good question was if the 1,222,000 km was from the surface of Saturn (in which point you would have need the radius of Saturn which is about 60,000 km) or from the center. It was from the center as I put on the board: the phrasing would have been better "1,222,000 km from the center of Saturn." 4b. (2 points) What is the velocity of Titan in its orbit, in m/s? _____________________m/s a = v2/r = 0.0255 m/s2, so v=(.0255 * 1.222 109)1/2 m/s = 0.558 104 m/s or 5580 m/s.  5. (4 points) If two people pull to the right (forwards) on the box as shown (one pulls with 200 N force 30 o above the horizontal upwards, one pulls with 300 N force 45 o below the horizontal downwards), what angle ( in degrees above the horizontal must a third person pull on the back of the box to the left (backwards) to keep it motionless, i. e. to cancel both the x-component and the y-component of the net force in the forwards direction? ___________ o First, find the net forces in the x and y direction to the right: Fx= 200 cos30 + 300 cos 45 = 385 N Fy=200 sin30 - 300 sin45 = 100 - 212 = -112 N So this gives a net force of (3852 + 1122)1/2 = 401 N at an angle below the horizontal to the right of (=tan-1 -112/385 = -16.2 o, so the force to the left to counteract this force is 401 N at an angle of +16.2o above the horizontal to the left. A number of people got this confused. I thought saying "cancel both the x-component and the y-component of the net force in the forwards direction" made it clear. Please take another look at this solution so you can get it on the final.  6. An object is thrown from the top of a 60 m height above the ground with an initial speed of v0=50 m/s at an angle of 35o above the horizontal. (1 point) What is the initial vertical component (voy) of the velocity, in m/s, 3 sig figs? _______________m/s voy=vo*sin35o=50m/s*0.574=28.7 m/s (1 point) How long does it take before the object starts to fall back down, in s? (Another way to ask this is 'how long until the object's vertical velocity=0') ___________________s vy=v0y - ayt 0=28.7 m/s - gt so t=28.7/9.8 s = 2.93 s c. (2 points) How high above its initial starting point does the object rise up to before vy = 0 ____________________m y-y0 = voyt - 1/2 gt2 so y-y0 = 28.7 m/s * 2.93 s - 1/2 9.8 m/s2 (2.93 s)2 = 42 m (Another way to solve this would be to realize from a graph of velocity vs time (which is a straight line with slope = acceleration since vy=v0y - gt) that - since v vs t is linear, the average v is just 1/2(v0y + v(at time=2.93 s)) = 1/2 (0 + 28.7 m/s) = 14.35 m/s. And, if we know vaverage, then d=vaverage*t = 14.35 m/s * 2.93 s = 42 m, i. e. the same answer. d. (2 points) From this highest point, how long in seconds does the object take to fall all the way to the ground (i. e. fall back not just to the height it started from, but in addition all the way to the ground, which is 60 m below the starting point.) So the total height the object has to fall is your answer to c.) plus 60 m. _________________s y-y0 = voyt - 1/2 gt2 but we know that the total height to fall is 42+60 m. 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