Technoboi11

When a particle moves on a circle at constant speed, its acceleration vector: a) is zero m/s^2 b) points toward the center of the circle. c) points parallel to its velocity vector. It's zero m/s^2 since it's moving at a constant speed, right? No. Remember...

18 years ago

Two vectors are given by a = 3.3i + 6.5j, and b = 2.5i + 4.9j. Find a) a·b = b) (a + b)·b = c) the component of a in the direction of b = a) (3.3x2.5) + (6.6x4.9) = b) (5.8x2.5) + (11.4x4.9)= c) (a·b)/(magnitude of b)= Great! I got it :)

18 years ago

A force F = (4.0 N)i + cj acts on a particle as the particle goes through displacement d = (3.4 m)i - (2.0 m)j. (Other forces also act on the particle.) What is the value of c if the work done on the particle by force F is each of the following? (a) zero...

18 years ago

A cold package of hot dogs slides rightward across a frictionless floor through a distance d = 20.5 cm while three forces are applied to it. Two of the forces are horizontal and have the magnitudes F1 = 5.00 N and F2 = 1.00 N; the third force is angled do...

18 years ago

A can of sardines is made to move along an x axis from x1 = 0.2 m to x2 = 1.2 m by a force given by F = iF0exp(-0.4x), with x in meters and F0 = 4.5 N. (Here exp is the exponential function.) How much work is done on the can by the force? Work is the inte...

18 years ago

A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t 2 + 1.0t 3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to...

18 years ago

What work is done by a force (in newtons) F = 3.1xi + 3.1j, with x in meters, that moves a particle from a position r1 = 2.1i + 2.5j to r2 = - -4.9i -3.9j? Work is the dot product of Force and displacement. Change in displacement is r2 minus r1. I will be...

18 years ago

What work is done by a force (in newtons) F = 3.1xi + 3.1j, with x in meters, that moves a particle from a position r1 = 2.1i + 2.5j to r2 = - -4.9i -3.9j? For Further Reading * Physics/Math - bobpursley, Thursday, March 1, 2007 at 6:27am Work is the dot...

18 years ago

An iceboat is at rest on a frictionless frozen lake when a sudden wind exerts a constant force of 212 N, toward east, on the boat. due to the angle of the sail, the wind causes the boat to slide in a straight line for a distance of 7.0 m in a direction 20...

18 years ago

At a certain instant, a particle-like object is acted on by a force F = (3.0 N) i - (1.0 N) j + (8.0 N) k while the object's velocity is v = - (2.0 m/s) i + (4.0 m/s) k. What is the instantaneous rate at which the force does work on the object? (b) At som...

18 years ago

A machine carries a 5.0 kg package from an initial position of di = (0.50 m) i + (0.75 m) j + (0.20 m) k at t = 0 to a final position of df = (8.00 m) i + (11.0 m) j + (7.40 m) k at t = 13 s. The constant force applied by the machine on the package is F =...

18 years ago

A 2.8 kg body is at rest on a frictionless horizontal air track when a horizontal force F acting in the positive direction of an x axis along the track is applied to the body. The force F is applied to the body at t = 0, and the graph records the position...

18 years ago

You drop a 1.8 kg textbook to a friend who stands on the ground 9 m below the textbook with outstretched hands 1.50 m above the ground. (a) What is the speed of the textbook when it reaches the hands? m/s (b) If we substituted a second textbook with twice...

18 years ago

A 1.50 kg snowball is fired from a cliff 12.5 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal. (a) Using energy techniques, rather than techniques of Chapter 4, find the speed of the snowball as it reaches the ground below...

18 years ago

A thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle and released. (a)What is the speed of the ball at the l...

18 years ago

Zero, a hypothetical planet, has a mass of 1.0 1023 kg, a radius of 3.0 106 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 107 J, what will be its...

18 years ago

Ok...I figured out part a but I am having trouble with b. part a was: Zero, a hypothetical planet, has a mass of 1.0x10^23 kg, a radius of 3.0x10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe i...

18 years ago