orange chaddi Flashcards
A constant force of 12 N in the positive x direction acts on a 4.0 kg object as it moves from the origin point (6i-8j) m. How much work is done by the given force during this displacement?
a. +60 J
b. +84 J
c. +72 J
d. +48 J
e. +57 J
c. +72 J
A 5.0 kg object is pulled along a horizontal surface at a constant speed by a 15 N force acting 20 degrees above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J
b. 82 J
c. 85 J
d. 74 J
e. 43 J
c. 85 J
A 2.0 kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ
b. -0.29 kJ
c. +30 J
d. -30 J
e. -50 J
b. -0.29 kJ
How much work is done by a person lifting a 2.0 kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ
b. 0.20 kJ
c. 0.24 kJ
d. 0.27 kJ
e. 0.31 kJ
b. 0.20 kJ
A 2.5 kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much is work by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J
b. +20 J
c. -2.0 J
d. -20 J
e. +40 J
d. -20 J
A 2.0 kg particle has an initial velocity of (5i-4j) m/s. Some time later, its velocity is 7i+3j m/s. How much work was done by the resultant force during this time interval, assuming no energy is lost in the process?
a. 17 J
b. 49 J
c. 19 J
d. 53 J
e. 27 J
a. 17 J
A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?
a. 2.7 J
b. 1.0 J
c. 2.2 J
d. 1.6 J
e. 3.2 J
c. 2.2 J
A constant force of 15 N in the negative y direction acts on a particle as it moves from the origin to the point (3i-3j-1k) m. How much work is done by the given force during this displacement?
a. +45 J
b. -45 J
c. +30 J
d. -30 J
e. +75 J
b. -45 J
An object moving along the x axis is acted upon by a force Fx that varies with position as shown. How much work is done by this force as the object moves from x = 2 to x = 8 m?
a. -10 J
b. +10 J
c. +30 J
d. -30 J
e. +40 J
c. +30 J
A body moving along the x axis is acted upon by a force Fx that varies with x as shown. How much work is done by this force as the object moves from x =1 to x = 8 m?
a. -2 J
b. -18 J
c. -10 J
d. -26 J
e. +18 J
d. -26 J
A force acting on an object moving along the x axis is given by Fx = (14x-3x^2) N where x is in m. How much work is done by this force as the object moves from x=-1 to x=+2 m?
a. +12 J
b. +28 J
c. +40 J
d. +42 J
e. -28 J
a. +12 J
The force an ideal spring exerts on an object is given by Fx = -kx, where x measures the displacement of the object from its equilibrium (x=0) position. If k = 60 N/m, how much work is done by this force as the object moves from x = -0.20 to x = 0?
a. -1.2 J
b. +1.2 J
c. +2.4 J
d. -2.4 J
e. +3.6 J
b. +1.2 J
A 4.0 kg block is lowered down a 37 degree incline a distance of 5.0 m 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 is 20 J. How much work is done on the block by the force of friction between A and B?
a. -58 J
b. -53 J
c. -68 J
d. -63 J
e. -47 J
c. -68 J
If the resultant force acting on a 2.0 kg 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?
a. +36 J
b. +28 J
c. +32 J
d. +24 J
e. +60 J
d. +24 J
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 the kinetic energy at its final position?
a. 62 J
b. 53 J
c. 73 J
d. 86 J
e. 24 J
b. 53 J
A block slides on a rough horizontal surface from point A to point B. A force (magnitude P = 2.0 N) acts on the block between A and B as shown. Points A and B are 1.5 m apart. If the kinetic energies of the block at A and B are 5.0 J and 4.0 J respectively, how much work is done on the block by the force of friction as the block moves from A to B?
a. -3.3 J
b. +1.3 J
c. +3.3 J
d. -1.3 J
e. +4.6 J
a. -3.3 J
A 2.0 kg block slides down a frictionless incline from point A to point B. A force (magnitude P = 3.0 N) acts on the block between A and B, as shown. Points A and B are 2.0 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B?
a. 27 J
b. 20 J
c. 24 J
d. 17 J
e. 37 J
c. 24 J
A 3.0 kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37 degrees above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?
a. -34 J
b. -64 J
c. -30 J
d. -94 J
e. +64 J
a. -34 J
A 10 kg block on a horizontal frictionless surface is attached to a light string (force constant = 0.80 kN/m) The block is initially at rest at its equilibrium position when a force (magnitude P = 80 N) acting parallel to the surface is applied to the block, as shown. What is the speed of the block when it is 13 cm from its equilibrium position?
a. 0.85 m/s
b. 0.89 m/s
c. 0.77 m/s
d. 0.64 m/s
e. 0.52 m/s
a. 0.85 m/s
A 10 kg block on a horizontal frictionless surface is attached to a light spring (force constant = 1.2 kN/m) The block is initially at rest at its equilibrium position when a force (magnitude P) acting parallel to the surface is applied to the block, as shown. When the block is 8.0 cm from the equilibrium position, it has a speed of 0.80 m/s. How much work is done on the block by the force P as the block moves the 8.0 cm?
a. 8.3 J
b. 6.4 J
c. 7.0 J
d. 7.7 J
e. 3.9 J
c. 7.0 J
A 20 kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m). The block is pulled 10 cm to the right from its equilibrium position and released from rest. When the block has moved 2.0 cm toward its equilibrium position, its kinetic energy is 13 J. How much work is done by the frictional force on the block as it moves the 2.0 cm?
a. -2.5 J
b. -1.4 J
c. -3.0 J
d. -1.9 J
e. -14 J
b. -1.4 J
The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m
a. 3.7 m/s
b. 4.4 m/s
c. 4.9 m/s
d. 5.4 m/s
e. 14 m/s
a. 3.7 m/s
A 2.0 kg block situated on a frictionless incline is connected to a light spring (k = 100 N/m) as shown. The block is released from rest when the spring is unstretched. The pulley is frictionless and has negligible mass. What is the speed of the block when it has moved 0.20 m down the plane?
a. 76 cm/s
b. 68 cm/s
c. 60 cm/s
d. 82 cm/s
e. 57 cm/s
c. 60 cm/s
A 2.0 kg block sliding on a frictionless horizontal surface is attached to one end of a horizontal spring (k = 600 N/m) which has its other end fixed. The speed of the block when the spring is extended 20 cm is equal to 3.0 m/s. What is the maximum speed of this block as it oscillates?
a. 4.6 m/s
b. 5.3 m/s
c. 5.7 m/s
d. 4.9 m/s
e. 3.5 m/s
a. 4.6 m/s