2010年9月15日 · The vertical velocity of the package was given in a graph and using kinematic equations, it was determined that the package reached a maximum height of 19.6 m above the break-free point and the break-free point was 6.0 s above the ground. At t = 4 s, the package was at its maximum height and had an instantaneous velocity of zero.

2014年3月30日 · Another possible way to locate a break would be to measure the capacitance between the line and ground - from each end. You could expect something like 60pF per metre but you wouldn't need to know that if you could measure from each end. The ratio of capacitances would give the ratio of distances between the ends and the break.

2009年6月25日 · The compressive force per area necessary to break the tibia in the lower leg, is about F/A =1.6 ×10 N m^2. The smallest cross sectional area of the tibia, about 3.2 cm^2, is slightly above the ankle. Suppose a person of mass m =6.0 ×10 kg jumps to the ground from a height h0 =2.0 m and absorbs the shock of hitting the ground by bending the knees.

2003年11月17日 · Gates was in the tiny community of Kemmerer Monday to break ground on the project. The co-founder of Microsoft is chairman of TerraPower. The company applied to the Nuclear Regulatory Commission in March for a construction permit for an advanced nuclear reactor that uses sodium, not water, for cooling. If approved, it would operate as a ...

2010年3月6日 · Walking by a pond, you find a rope attached to a tree limb 5.2 m off the ground. You decide to use the rope to swing out over the pond. The rope is a bit frayed but supports your weight. You estimate that the rope might break if the tension is 80 N greater than your weight. You grab the rope at a point 4.6 m from the limb and move back to swing

2004年5月31日 · In summary, the conversation discusses an explosion that breaks an object into two pieces with different masses and calculates the kinetic energy acquired by each piece using conservation of momentum and kinetic energy equations.

2005年9月29日 · The gopher manages to break free at a height of 12 m. What is the magnitude of the gophers velocity as it reaches the ground? What formula is used to do to calculation? This is a multiple choice question, but using the Pythagorean Theorem doesn't yield any of the choices. The choices: 8.9 m/s, 9.8 m/s, 11 m/s 18 m/s or 22 m/s?

2010年6月25日 · The moment it hits the concrete, the concrete starts to break up and the hammer moves a little further before completely stopping. You could try to measure how much the hammer typically moves after hitting the concrete and estimate the average force from that. Most of the force will actually be exerted on the ground.

2013年2月12日 · A movie stuntwoman drops from a helicopter that is 30.0 m above the ground and moving with a constant velocity whose components are 10.0 m/s upward and 15.0 m/s horizontal and toward the south. You can ignore air resistance. Homework Equations y=yo+vo*t+1/2*a*t^(2) The Attempt at a Solution I am confused on how the vectors should be …

2008年12月8日 · Once you leave the ground you will be on a freefall path. It'll take much longer than .1s to leave the Earth's atmo. Earth's escape velocity is around 7 miles per second, so once your feet leave the ground, you'll have to be traveling at least that fast (and that ignores air drag).