Popular questions and responses by ATT
  1. physics

    If the resultant force acting on a 2kg object is equal to (3i+4j)N, what is the change in kinetic energy as the object moves from (7i-8j)m to (11i-5j)m?

    asked on March 30, 2018
  2. physics

    A 4kg block is lowered down a 37° incline a distance of 5m from point A to point B. A horizontal force (F = 10 N) is applied to the block between A and B as shown in the figure. The kinetic energy of the block at A is 10 J and at B it is 20 J. How much

    asked on March 30, 2018
  3. physics

    As a 2.0-kg object moves from (2i+5j)m to (6i-2j)m, the constant resultant force acting on it is equal to (4i-3j)N. If the speed of the object at the initial position is 4.0 m/s, what is its kinetic energy at its final position? Ans: 40J

    asked on March 31, 2018
  4. physics

    A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?

    asked on April 1, 2018
  5. physics

    A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.8kN?

    asked on March 19, 2018
  6. physics

    A bead slides without friction around a loop-the-loop. The bead is released from a height h = 3.5R. A is at the highest point of the loop and R is the radius of the loop (a) What is its speed at point A? (b) How large is the normal force on it if its mass

    asked on April 3, 2018
  7. physics

    At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?

    asked on March 31, 2018
  8. physics

    At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?

    asked on April 1, 2018
  9. physics

    A 3kg mass sliding on a frictionless surface has a velocity of 5m/s east when it undergoes a one-dimensional inelastic collision with a 2kg mass that has an initial velocity of 2m/s west. After the collision the 3kg mass has a velocity of 1m/s east. How

    asked on March 31, 2018
  10. physics

    Two blocks connected by a cord passing over a small, frictionless pulley rest on frictionless planes: a) What is the acceleration of the blocks? b) What is the tension in the cord? c) Which way will the system move when the blocks are released from rest?

    asked on March 16, 2018
  11. physics

    What is the gravitational force on a 20Kg satellite circling the earth (Re = 6.4 x 10^6 m, Me = 6 x 10^24Kg) with a period of 5hr?

    asked on March 17, 2018
  12. physics

    As in the figure below, a simple harmonic oscillator is attached to a rope of linear mass density 5.4 ✕ 10^−2 kg/m, creating a standing transverse wave. There is a 3.2-kg block hanging from the other end of the rope over a pulley. The oscillator has an

    asked on April 30, 2018
  13. physics

    The figure below shows a cubical box that has been constructed from uniform metal plate of negligible thickness. The box is open at the top and has edge length L = 39 cm. (a) Find the x coordinate of the center of mass of the box. (b) Find the y coordinate

    asked on April 1, 2018
  14. physics

    A 6 kg mass is attached to a light cord that passes over a massless, frictionless pulley. The other end of the cord is attached to a 3.5 kg mass as in Figure below. Use conservation of energy to determine the final speed of the 6kg mass after it has fallen

    asked on March 31, 2018
  15. physics

    A skier slides down a hill starting with zero velocity at a height of h1 = 45.2 m above the bottom of the hill. The shape of the terrain is like a cosine wave. a) What is the velocity of the skier on top of the second, intermediate hill, whose height is h2

    asked on March 30, 2018
  16. physics

    While a boat is being towed at a speed of 11m/s, the tension in the towline is 9.5kN. What is the power supplied to the boat through the towline?

    asked on March 30, 2018
  17. physics

    A force given by F(x) = 4x^3 x̂ (in N/m^3) acts on a 1kg mass moving on a frictionless surface. The mass moves from x = 4 m to x = 7 m. (a) How much work is done by the force? (b) If the mass has a speed of 1 m/s at x = 4 m, what is its speed at x = 7 m?

    asked on March 30, 2018
  18. physics

    A constant force, F = (4.39, −3.79, 2.02) N, acts on an object of mass 19.5 kg, causing a displacement of that object by r = (4.02, 3.68, −2.45) m. What is the total work done by this force?

    asked on March 30, 2018
  19. physics

    A boy on board a cruise ship drops a 30g marble into the ocean. If the resistive force proportionality constant is 0.5kg/s, what is the terminal speed of the marble in m/s?

    asked on March 18, 2018
  1. physics

    your answer is not correct

    posted on April 1, 2018
  2. physics

    How do I find the distance for a 5 hr period.?

    posted on March 17, 2018
  3. physics

    how do I calculate the tesion in the cord? Is it 100sin30 and 50sin33.1?

    posted on March 16, 2018