...direction), then: W = Fdcos0 = Fd F = W/d = 73.5

**N**1 Answers · Science & Mathematics · 11/12/2008

... initial potential energy of the bowling ball at the top of the tower is: PE = mgh = (70

**N**)(15 m) (note: you are ...39;s the weight of the ball) = 1050**J**. At the ground, all...2 Answers · Science & Mathematics · 27/12/2011

...2mgh simplified: 0.7mv^2 = mgh 0.7 x (63.5/9.8) x 5.5^2 = 137.2

**J**137.2**J**= work done by force work done = force x distance 137...2 Answers · Science & Mathematics · 20/03/2011

### How much work in done on an 80

**N**bowling ball when you move it horizontally across**a**10 m wide room?We know work done = force*displacement = 80*10

**J**= 800**J**When lifted 0.5 m,work done = 80*0.5 = 40**J**3 Answers · Science & Mathematics · 19/05/2013

...so all the energy is gravitational potential energy. mgh = 1620

**J**h = 1620 / 7 / 9.8 h = 23.6m But you released...continue 23.6 - 2 = 21.6m Above your head...**a**bowling ball! RUN!6 Answers · Science & Mathematics · 23/09/2008

**a**. The ball comes off the recoil at the same speed. Since it was moving in the positive... the change in momentum is p(final) - p(initial) = -7kg*m/s - 7kg*m/s = -14kg*m/s c. Impulse (**J**) is defined by two equations: Impulse = change in momentum = Force * Time...3 Answers · Science & Mathematics · 25/12/2009

1 Joule = 1 Newton * meter 35

**J**= x**N*** 0.5m (35 Nm / 0.5m) = xN 75**N**= xN x = 75N mass = 75N / 9.8N mass = 7.7kg2 Answers · Science & Mathematics · 11/09/2008

...p1 = m*v1 Final momentum of bowling ball: p2 = m*v2 Impulse-momentum theorem:

**J**= p2 - p1**J**= m*(v2 - v1...v2 - v1)/deltat You will get**a**negative number, reverse the v'...2 Answers · Science & Mathematics · 11/07/2011

bowling ball: Ek = ½mv² = ½•7.41kg•(2.56m/s)² = 24.3 J ping-pong: Ek = 24.3 J = ½•0.00221kg•v² v...

2 Answers · Science & Mathematics · 06/01/2011

... F = m*

**a***(1+k) where k for**a**solid sphere = 0.40 F = 4*2*1.4 = 11.2**N**...............Answer X = ... = F*X = 11.2*1 = 11.2**J**............Answer for both parts...1 Answers · Science & Mathematics · 14/12/2012