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  1. ... with a velocity of 400 m/s from physics, its height h above the ground after t seconds is h(t)= -16t^2+400t a. find...

  2. The answers you quoted does NOT give a complete explanation to the question, and the writer showed incorrect concepts in the remarks. The remarks should be rewritten as : Fnet = 0 N ⇒ constant velocity or at...

  3. Impulse F.(Δt) can be positive or negative, depending on the direction of force. 2015-07-28 16:15:35 補充: Your suppl question: The rate of change of momentum is proportional to the applied force. This is Newton's...

  4. ...s⁻² Take downward quantities as positive. Let h m above the ground be the height of the balls meet in air. Ball ...

  5. 1. (a) Distance travelled by satellite in one period = 2. pi.(3.59x10^7 + 6.14x10^6) m = 2.64 x 10^8 m Speed of satellite = square-root[GM/R] where G is the Gravitational constant = 6.67 x 10^-11 m^3/kg.s^2 M is the mass of the earth = 5.97 x 10^24 kg...

  6. 1(a) Let u be the initial speed of the bullet. By conservation of momentum, 0.05u = (0.05+1) x 5 i.e. u = 105 m/s (b) Use impulse = change of momentum of the block F(0.2) = 1 x 5 where F is the force acts on the block F = 25 N 2. (a) Fall in height of the person = (30...

  7. ...just the idea and you can try to rewrite it) 2015-06-16 21:37:10 補充: the (c) above is (d) (c) thinking distance = (80/3.6)(0.31) = 6.88888889m 0 = (80/3...

  8. ... the definition of potential, i.e. energy per unit charge. As said above , the analogy in mechanics is : h = (mgh)/mg where h is the height...

  9. ...doesn't return to the same position. (c) Period of wave = 4 s (see (b) above ) (d) The whole sine-curve shifts slightly to the right.

  10. 1. Your calculation is correct. 2. Your calculation is correct. 3. Yes, calculation is correct.