Physics Work,Power & Energy Level: High School
A car traveling with a speed of 3.0 m/s is coasting towards a 20 degree incline . determine how far the car coast up the hill Uk = 0.47 hint , sine theta = h/x .
Physics Work,Power & Energy Level: High School
A spring with a constant of 225 N/m is horizontally compressed 0.30 . A 0.50 kg is then placed against the spring ( like a pinball ) Determine the velocity of the ball when it reaches the spring’s equilibrium position .
Physics Work,Power & Energy Level: High School
A 1.5 kg object is dropped from a height of 75 m . However , the object reaches the ground only traveling at 33 m/s . Determine how much energy was lost due to air resistance .
Physics Work,Power & Energy Level: High School
A 0.0025 kg bullet traveling at 340 m/s is hot into a gelatinous glob . The bullet then exits the glob with a velocity of 33 m/s . How much work did the glob do to the bullet ?
Physics Work,Power & Energy Level: High School
A 6.0 kg object, initially at rest in outer space , “explodes “ into three segments of equal mass . Two of these elements are observed to be moving with equal speeds of 20 m/s with an angle of 60 degree between their direction of motion . How much kinetic energy is released in this explosion ?a. 2.4 k Joules
b. 2.9 k Joules
c. 2.0 k Joules
d. 3.4 k Joules
e. 1.2 k Joules
Physics Work,Power & Energy Level: High School
A 2.0 kg kilogram object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0 kg object moving with a speed of 2.0 m/s in the same direction . How much kinetic energy is lost in this collision ?1. 2.4 Joules
2. 9.6 Joules
3. 5.4 Joules
4. 0.6 Joules
5. 6.0 Joules
Physics Work,Power & Energy Level: High School
A women does 200 J of work to move a table 4m across the floor . What is the magnitude of the force that the women applied to the table if this force is applied in the horizontal direction ?
Physics Work,Power & Energy Level: High School
A child pulls a block across the floor with force applied by a horizontal held string . A smaller frictional force also acts upon the black , yielding a net force on the block that is smaller than the force applied by the string . Does the work done by the force applied by the string equal the change in kinetic energy in this situation ? Explain .
Physics Work,Power & Energy Level: High School
A women uses a pulley arrangement to lift a heavy crate . She applies a force that is one fourth the weight of the crate , but moves the rope a distance four times the height that the crate is lifted . Is the work done by the women greater than equal to , or less than the work done by the rope on the crate ? Explain .
Physics Work,Power & Energy Level: High School
A skier starts at the top of a ski jump , which is 25.0 m above his landing point on the slope below . The ski jump is assumed to be frictionless .(a) With what velocity will the skier touch the ground ? (use principle of conservation of energy ) .
(b) After landing let us assume that there is some friction on the ground. Use the work-energy principle to calculate the stopping distance of the skier if the coefficient of kinetic friction between the skier and the ground is 0.60 .
Physics Work,Power & Energy Level: High School
A stone of mass 5.0 kg is dropped from height of 2 m above the ground . Neglect the air resistance acting on the stone .(a) Calculate the potential energy , kinetic energy, and the total mechanical energy of the stone at the point of release .
(b) The same at a height of 1.5 m above the ground .
(c) Using the conservation of mechanical energy calculate the speed of the stone just before it strikes the ground . what is the total mechanical energy of the stone in this case ? Does it verify the principle of conservation of energy ?
(d) Calculate the work done by the force of gravity on the stone when it strikes the ground . Does this verify the work –energy theorem ?
Physics Work,Power & Energy Level: High School
A 800 N box is pushed up a 4.0 m incline to a opening 2.0 m above the ground . The process requires 3200 J of work to be done . What is the average friction force along the plane ?
Physics Work,Power & Energy Level: High School
You are to pull a 2100 N sled 8.0 m at a slow speed across the floor by pulling with a force of 350 N on a rope angled at 20 degrees above the horizontal .(a) How much work will you do ?
(b) What work will friction will do ?
Physics Work,Power & Energy Level: High School
You are to pull a 2100 N sled 8.0 m at a slow speed across the floor by pulling with a force of 350 N on a rope angled at 20 degrees above the horizontal .(a) How much work will you do ?
(b) What work will friction will do ?
Physics Work,Power & Energy Level: High School
A cable lifts a 1350 kg elevator at a constant velocity for a distance of 33 m . What is the work done by each of the following ?(a) The tension in the cable
(b) The elevator weight .