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1. ### How many kilocalories of heat are generated when the brakes are used to bring a 1050 kg car to rest from a spe?

KE gets converted to Q, thermal energy KE = 1/2*m*v^2 Q = KE, assuming complete conversion to thermal energy. Thus Q = 1/2*m*v^2 Data: m:=1050 kg; v:=250/9 meters/sec; Result: Q = 405093...

2 Answers · Science & Mathematics · 16/01/2010

2. ### The outer edge of a rotating Frisbee with a diameter of 30 has a linear speed of 3.7. What is the angular spe?

Angular speed is in radians, so divide the linear speed by the radius. (3.7) / (15) = 0.247, in whatever units you're using.

2 Answers · Science & Mathematics · 07/06/2010

3. ### A soccer player kicks the ball toward a goal that is 29.0 m in front of him. The ball leaves his foot at a spe?

the x component of Vi = 18.7@31.0 deg is 16.03 m/s so t = d / Vx = 29.0 / 16.03 = 1.329 s and the initial y component is 9.631 m/s so using the time from above Vyf = Vyi + g t = 9.631 + (-9.81)(1.329) = -3.4065 m/s combining the final x and y components (16.03...

2 Answers · Science & Mathematics · 01/02/2011

4. ### A student throws a baseball at a large gong 45 m away and hears the sound of the gong 1.45989 s later. The spe?

first calculate the time it took for sound to travel 45m v = d/t so t = d/v t = 45/330 t = .13636 secs subtract this time from the total time t = 1.45989 - .13636 t = 1.32353 secs last, using the remaining time, find the average velocity of the thrown ball v = d/t v = 45/1.32353 v = 34 m...

3 Answers · Science & Mathematics · 22/12/2012

5. ### A 5.2 kg block is pushed 4.8 m up a rough 39° inclined plane by a horizontal force of 80 N. If the initial spe?

a) The work done by the horizontal force = F*d*cos(theta) Here: F = 80 N, d = 4.8 m (displacement), theta = 39 degree (angle between the force and the direction of motion). Therefore W = (80)(4.8)(cos39) = 298 J b) To find the final kinetic energy we will find the...

2 Answers · Science & Mathematics · 01/11/2012

6. ### In coming to a stop,car leaves skid marks on highway 320m long.assume deceleration of 10m/s2,estimate the spe-

v^2=u^2 + 2as (3rd equation of motion) where v=final velocity (0); u = initial velocity; a=acceleration (-10 m/s^2) and s=distance (320m). So u^2 = 2as = 2 x 320 x 10 = 6400. This gives u = 80 m/s

3 Answers · Science & Mathematics · 12/09/2006

7. ### A solid bowling ball with a radius of 10.9 cm and a mass of 7.1 kg rolls along a bowling alley at a linear spe?

For a solid sphere, I = (2/5)mr² and rotational KE = ½Iω² = ½ * (2/5)mr² * (v/r)² = (1/5)mv² So: translational KE = ½ * 7.1kg * (4.6m/s)² = 75 J rotational KE = (1/5...

2 Answers · Science & Mathematics · 09/11/2013

8. ### A 68-kg fisherman in a 126-kg boat throws a package of mass m = 15 kg horizontally toward the right with a spe?

we are going to work this out by using momentum mass of fisherman = 126kg mass of package=15m speed of boat =0m/s speed of package= 4.6m/s momentum before = momentum after (126 x 0) ( 15 x 4.6) = (126v) ( 15 x 0) [ the package will eventually come to rest afterwards] 69= 126v 69/126= v v=0.55m/s...

2 Answers · Science & Mathematics · 02/05/2017

9. ### A ball falls out of an airplane window. the airplane is 500m above the ground. find the kinetic energy and spe?

From your problem statement it sounds like you're only interested in the vertical dimension, and you also need to neglect the effect of aerodynamic drag. With these assumptions, right before the ball hits the ground it has converted...

2 Answers · Science & Mathematics · 15/07/2012

10. ### An astronaut traveling forward at 0.87c holds a meterstick in spear -like fashion. The astronaut sees the spe?

1 meter. .

2 Answers · Science & Mathematics · 18/12/2010