A 180kg load is moved 23m vertically with an acceleration a=0.150g by a single cable. Determine: a. the tension in the cable b. the net work done on the load c. the work done by the...
A 180kg load is moved 23m vertically with an acceleration a=0.150g by a single cable. Determine: a. the tension in the cable b. the net work done on the load c. the work done by the...
A 75kg hiker, originally 1200m above sea level climbs a 6300m tall mountain. a) How much work does the climber do? b) If the body is only 20% efficient in converting the energy stored in fat...
Estimate the average speed with which the hair on your head grows. Give your answer in both m/s and μm/h. Briefly describe how you arrived at the estimate.
A particle is projected upwards from the top of a tower. Treat point of projection as origin & upwards as positive. Consider three point on its path such that at (s represents displacement...
A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's net displacement...
A 300kg piano slides 4.5m down a 25° incline and is kept from accelerating by a man pushing back on it parallel to the incline. The coefficient of kinetic friction is 0.4 Calculate: a. the...
1. Use Dimensional Analysis to solve the following problems. can some one show me the steps with answ
1. Find the resistance of a 30 meter length of copper wire of 0.8 mm diameter. 2. How hot would a copper wire need to be for its resistance to be 3% larger than its value at room temperature (20ºC)...
A rock is thrown (not dropped) straight down from a bridge into the river below. What is the magnitude of rock's acceleration immediately after being released? Disregard air resistance. a)...
A speed skater moving across frictionless ice at 5.0m/s hits a 3.0-m-wide patch of rough ice, she slows steadily, then continues on at 3.7m/s. What is her acceleration on the rough ice? Use 2 significant...
A toy train is pushed forward and released at 2.0m with a speed of 0.5 m/s. It rolls at a steady speed for 2.0s, then one wheel begins to stick. The train comes to a stop at 5.0m from the point at...
the initial velocity of a particle is u and the acceleration is given by a=kt, where k is a positive constant. the distance travelled in time t is
Two point charges, Q1 = 3.7 μC and Q2 = -1.3 μC, are placed on the x axis. Suppose that Q2 is placed at the origin, and Q1 is placed at the coordinate x1 = -5.0 cm. (a) At what point(s) along...
A large electroscope is made with "leaves" that are 78-cm-long wires with tiny 47 g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires...
how would you solve this? thanks
The end of Hubbard Glacier in Alaska advances by an average of 105 feet per year. What is the speed of advance of the glacier in m/s?
Dear teacher People say : energy is the ability to do work But then" what is work ?" I asked : they said " work is energy tranfered by force " Bla , they use energy...
The charge on a capacitor increases by 18 μC when the voltage across it increases from 93 V to 118 V. What is the capacitance of the capacitor?
The electric field between the plates of a paper-separated (K=3.75) capacitor is 8.25×104 V/m. The plates are 2.15 mm apart, and the charge on each plate is 0.670 μC. (a) Determine...
Is sound energy renewable or non-renewable?