Physics Work,Power & Energy Level: High School
You are change of a cannon that exerts a force 13600 N on a cannon ball while the ball is in the barrel of the cannon . The length of the cannon barrel is 2.32 m and the cannon is aimed at a 47.1 degrees angle from the ground . The acceleration of gravity is 9.8 m/s2 . If you want the ball leave the cannon with speed vo = 80.8 m/s . What mass cannon ball must you use ? Answer in units of kg .
Physics Work,Power & Energy Level: High School
A car and driver weighing 7770 N passes a sign stating “Bridge Out 21.6 Ahead.” . She slams on the brakes , and the car decelerates at a constant rate of 13.3 m/s2 . The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the work done stopping the car if the car just stops in time to avoid diving into the water ? Answer in units of J .
Physics Work,Power & Energy Level: High School
A 2.2 kg block is pushed 1.36 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of 68.4 degrees with the horizontal . The acceleration of gravity is 9.8 m/s squred . If the coefficient of kinetic friction between the block and the wall is 0.511 , find the work done by F . Answer in units of J .
Physics Work,Power & Energy Level: High School
A baseball is hit high into the upper bleachers of left field . After the ball lands in the bleachers , the work done by gravity and the work done by the air resistance , respectively , will have beena) Wg = negative ; Wa = positive
b) Wg = positive ; Wa = negative
c) Unknown since vital information is lacking .
d) Wg = negative , Wa = negative
e) Wg = positive , Wa = positive
Physics Work,Power & Energy Level: High School
A constant force is exerted for a short distance on a block of mass that is initially at rest on a horizontal frictionless plane . This force gives the block a certain final speed v . Suppose we repeat the experiment but, instead of starting from rest , the block is already moving with constant speed 2v in the direction of force at the moment we begin to apply the force , After we exert the same constant force for the same distance , the increase in the block’s speeda) Cannot be determined from the information provided .
b) is zero.
c) is equal to v
d) is bigger than v
e) is less than v
Physics Work,Power & Energy Level: High School
A cart loaded with a bricks has a total mass of 9.35 kg and is pulled at constant speed by a rope . The rope is inclined at 24.4 degrees above the horizontal floor. The coefficient of kinetic friction between ground and cart is 0.734 . The acceleration of gravity is 9.8 m/s2. How much work is done on the cart by the rope ? Answer in units of kJ .
Physics Work,Power & Energy Level: High School
A force F is exerted by a broom handle on the head of the bottom , which has a mass m . The angle is at an angle theta to the horizontal . What is the work done by the force on the head of the boom as it moves a distance d across a horizontal force ?a) W = F d Sin theta
b) W = Fm Cos theta
c) W = Fm Tan theta
d) W = Fmd Sin theta
e) W = Fd Cos theta
Physics Work,Power & Energy Level: High School
A student , later for class , ran up some stairs between landings . The landing are 11.2 m apart . The student has a mass of 51.6 kg and it took 6.88 s to do the run . The acceleration of gravity is 9.8 m/s2 . What is the average power that the student was generating during the run ? Answer in units of W .
Physics Work,Power & Energy Level: High School
A box of mass m with an initial velocity of vo slides down a plane , inclined at theta with respect to the horizontal . The coefficient of kinetic friction is mu . The box stops after sliding a distance x . How far does the box slide ?a) X = v0 squared /g (mu Sin theta -2 Cos theta)
b) X = v0 squared / 2g( mu Cos theta + Sin theta )
c) X = v0 squared /2g sin theta
d) X = v0 squared/g (mu Sin theta + Cos theta )
e) X = v0 squred/2g (mu Sin theta – Cos theta )
f) X = v0 squared /2g (mu Cos theta – Sin theta )
g) X = v0 squared/2g (Sin theta- mu Cos theta)
h) X = v0 squared/2g (mu Sin theta + Cos theta )
i) X = v0 squared / g ( Sin theta – mu Cos theta )
j) X = v0 squred / 2g mu Cos theta
Physics Work,Power & Energy Level: High School
A mass of 0.25 kg is initially at rest on a horizontal surface . A force , given by F = Fxi , acts on the mass . The horizontal component Fx is plotted below as a function of position along the x axes . The coefficient of kinetic friction is 0.035 . The acceleration of gravity is 9.8 m/s2 . Calculate the kinetic energy K of the mass as it reaches 6 m . Answer in units of J .
Physics Work,Power & Energy Level: High School
A force F = axi + byj where a = 1.8 N/m and b = 1.3 N/m , acts on an object moves in the I direction along the x axis from the original to C = 7.6 m . Find the work done on the object by the force . Answer in units of J .
Physics Work,Power & Energy Level: High School
A force F = Fxi, Fxj acts on an object with Fx = 4 N and Fy = 4 N . The angle between F and the displacement vector, s, is 21 degrees , and 85.9 J of work is done by F , Find the magnitude of S . Answer in units of m .
Physics Vectors Level: High School
You drag a 20 kg steamer trunk over a rough surface by a constant force of 195 N acting at an angle of 34.9 degrees above the horizontal . You move a trunk over a distance of 32.9 m in a straight line, and the coefficient of kinetic friction is 0.248 . The acceleration of gravity is 9.8 m/s2 . How much is the work done on the block by the net force ? Answer in units of J .
Physics Vectors Level: High School
There are two vectors A and B . Vector A has components A x = -6, Ay = 7.8; Az = 2.5 ; While vector B has components01 B x = 7.8 ; By = -4.5; Bz = 7.3 . Find the angle theta AB between these vectors ? (Answer between 0 degrees and 180 degrees ) . Answer in units of degrees .
Physics Work,Power & Energy Level: High School
A skier traveling 13.0 m/s reaches the foot of a steady upward 16.4 incline and glides 12.7 m up along this slope before coming to rest . What was the average coefficient of friction ?