Motion Very
28 May 2010
Motion Very
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 BRIGHT LED BAR Neon SIGN Coffee ANIMATED MOTION 110V $16.49 Time Remaining: 18h 3m |
 Bright Animated Neon LED CELL PHONE CELLPHONE Sign w Motion ON OFF 19 X 10 $18.98 Time Remaining: 9d 12h 29m Buy It Now for only: $18.98 |
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 BRIGHT LED BAR Neon SIGN Coffee ANIMATED MOTION 110V Bar2 $18.49 Time Remaining: 18h 3m |
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 BRIGHT LED Light Pizza 2 Neon SIGN ANIMATE Busines Open Sign 220V P2 $18.39 Time Remaining: 18h 3m |
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 SIDEWALK SWINGER SIGN WITH FREE OPEN HEADER $161.00 Time Remaining: 26d 6h 58m Buy It Now for only: $161.00 |
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 22x13 Coffee Shop Led Lighted Sign Window Animated Flash Motion Neon Cafe Open $49.95 (1 Bid) Time Remaining: 3d 2h 20m |
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 SIDEWALK SWINGER SIGN WITH FREE SPECIALS HEADER $161.00 Time Remaining: 5d 10h 38m Buy It Now for only: $161.00 |
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 Bright Animated Neon LED ATM Sign w Motion ON OFF 508 Gas Station Grocery Stor $19.95 Time Remaining: 4d 11h 39m Buy It Now for only: $19.95 |
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 16x12 Flashing Illuminated Erasable Neon LED Ads Writing Menu Board Sign Message $59.95 Time Remaining: 4d 11h 59m |
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 22x13 Coffee Shop Led Lighted Sign Window Animated Flash Motion Neon Cafe Open $49.95 Time Remaining: 5d 39m |
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 Animated LED Neon LED OPEN Sign with Motion ON OFF 10 $24.95 Time Remaining: 7d 8h 50m Buy It Now for only: $24.95 |
 16x65 Open Closed Led Lighted Sign Window Display Animated Flash Motion Neon $56.90 Time Remaining: 5d 4h 59m |
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 22x13 ATM Led Lighted Business Sign 24hr Bank Cash Money Open Animated Motion $46.95 Time Remaining: 6d 2h 35m |
 New Super Bright LED Neon Light Coffee Shop Cafe Cup 16 $22.99 Time Remaining: 10d 14h 35m Buy It Now for only: $22.99 |
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 22x13 Open Led Lighted Sign Window Animated Flashing Motion Neon Business Club $46.95 Time Remaining: 6d 4h 19m |
 Two 2 Bowl Bunn Granita Slush Margarita Machine $2,499.99 Time Remaining: 29d 5h Buy It Now for only: $2,499.99 |
 22x13 Pizza Delivery Led Lighted Business Open Sign Animated Motion Neon $46.95 Time Remaining: 6d 6h 29m |
 NEW Large Bright Motion LED Neon OPEN Sign 21 x 13 Fast Ship from NY $38.88 Time Remaining: 2d 11h 4m Buy It Now for only: $38.88 |
 BRIGHT LED Neon Bright Motion Open Sign 19x10 220V O2 $18.97 Time Remaining: 18d 15h Buy It Now for only: $18.97 |
 16x12 Flashing Illuminated Erasable Neon LED Ads Writing Menu Board Sign Message $59.95 Time Remaining: 6d 11h 29m |
 NEW Animated LED Neon LED OPEN Sign with Motion ON OFF 25 Fast Ships from NY $18.98 Time Remaining: 22d 14h 6m Buy It Now for only: $18.98 |
 22x13 Coffee Shop Led Lighted Sign Window Animated Flash Motion Neon Cafe Open $49.95 Time Remaining: 6d 11h 51m |
 24x32 Writing Board LED Flashing Message Sign Stand Restaurant Menu Advertising $134.90 Time Remaining: 29d 11h 40m Buy It Now for only: $134.90 |
 NEW Bright Business Animated LED Neon LED OPEN Sign with Motion ON OFF 19 x 10 $18.98 Time Remaining: 9d 10h 55m Buy It Now for only: $18.98 |
 22x13 Open Telephone No Led Lighted Sign Window Display Animated Motion Neon $84.90 Time Remaining: 6d 13h 55m |
 NEMCO 3 8 EASY FRYKUTTER FRENCH FRY CUTTER N55450 2 $204.99 Time Remaining: 1d 10h 53m Buy It Now for only: $204.99 |
 Dormont Gas Connector Hose Model 16125 KIT 48 Additional Swival Connectors $99.00 Time Remaining: 6d 11h 37m |
 THERMADUKE Heating Table 4 well free shipping $499.00 Time Remaining: 21d 11h 7m Buy It Now for only: $499.00 |
This is a very weird physics question regarding projectile motion?
A golfer strikes a golf ball at an angle of 17 degrees above the horizontal. With what velocity must the ball be struck in order to reach the green, which is a horizontal distance of 250 meter from the golfer at the same height?
***The answer is 66 m/s, 17 degrees above horizontal but how on earth do you get to it?!!!
We require the total time of flight. The vertical component of velocity is
Vy = v.sin(17°) - gt where v is magnitude of launch speed.
This is zero at max height.
v.sin(17°) - gt = 0
t = v.sin(17°) / g
t = v.sin(17°) / 9.8
t = 0.0298.v
This is time taken to reach max height. By symmetry, total time
= 2t = 0.0597v
Horizontal distance (range) is x = v(2t)cos(17°) = 250
v(0.0597v )cos(17°) = 250
(0.0597)cos(17°) v² = 250
v² = 250 / ((0.0597)cos(17°)
= 4378.94
v = √(4378.94)
v = 66.17
Initial speed of ball is 66 m/s at angle indicated (17°)
