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1. ### When you see a traffic light turn red, you apply the brakes until you come to a stop. Suppose your initial spe?

You have used all of the allotted 110 characters in the first section and not completed the question. Try again putting the sentence beginning with 'Suppose' in the box marked Now add a little more detail...

2 Answers · Science & Mathematics · 09/03/2010

2. ### 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

3. ### 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

4. ### Ben is racing a light beam in a 100-meter dash. Ben bursts out of the starting blocks at 99 percent of the spe?

The answer is C, because in the spectators frame the sprinter is going .99c and light is traveling @ 1.00c: However in the frame of the runner, the light it STILL traveling @ 1c, the runner will say that the light beat him by...

2 Answers · Science & Mathematics · 20/05/2011

5. ### Physics Help: Car A travels with speed v around curve number one, which has a radius r. Car B travels with spe?

b

2 Answers · Science & Mathematics · 29/04/2010

6. ### 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

7. ### 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

8. ### 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

9. ### 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

10. ### A gas containing both hydrogen molecules and helium atoms has a temperature of 300 K. How does the average spe?

Helium is monoatomic. While Hydrogen is diatomic. Therefore, Since the molecular weight Helium is 2 and a diatomic Hydrogen is 2. I believe the speeds should be exactly the same. EDIT...

2 Answers · Science & Mathematics · 12/11/2012