A crane lifts a 200 kg block a height of 10 m in 18 seconds. What...
A crane lifts a block of mass 260 kg vertically at an acceleration of 8.5 m/s^2 through a height of 1.6 m. What is the net force on the block?
A student in the fitness center lifts a weight with m = 68.5 kg from the floor to a height of 1.90 meters in a time of 13.5 seconds. Find the average power exerted by the student during this time. Give your answer in watts (W) and with 3 significant figures.
Find the useful power output of an elevator motor that lifts a 2500-kg load a height of 35 m in 17 s, if it also increases the speed from rest to 4.25 m/s. Note that the total mass of the counterbalanced system is 10,000 kg--so that only 2500 kg is raised in height, but the full 10000 kg is accelerated.
9. A crane is to lift 2000 kg of material to a height of 150 m in 1 min at a uniform rate. What electric power is required to drive the crane motor if 35 percent of the electric power is converted to mechanical power? (is it reasonable to neglect the kinetic energy in this process?)
The crane lifts the 250 kg bin with an initial acceleration of 2.5 m/s2. Determine the force in its cable due to this motion. Also find what would the force be if instead of lifting, the bin descends with the same acceleration.
A 18 kg block slides up a hill to a height of 6.3 m. If 443 J of thermal energy are generated, how fast was the block going at the bottom of the hill?
You plan on using a 5000-kg-crane to vertically lift a very heavy mass (m), as shown in the figure. Assume the horizontal location of the crane’s center of mass is halfway between the front and rear bumper of the crane. (a) What is the largest mass that can safely be lifted without the crane tipping over? (b) If the maximum mass is lifted vertically, what is the maximum height it can be lifted without tipping the crane over? Xcom for,...
A crane lifts a statue from the ocean with a cable. The statue's density is 2700kg/m^3 and it's mass is 2000kg. What is the torque of the cable when: a) it lifts the statue while it's still underwater (density of ocean is 1025 kg/m^3) b) the statue is completely out of the water?
You plan on using a 5000-kg-crane to vertically lift a very heavy mass (m), as shown in the figure. Assume the horizontal location of the crane’s center of mass is halfway between the front and rear bumper of the crane. (a) What is the largest mass that can safely be lifted without the crane tipping over? (b) If the maximum mass is lifted vertically, what is the maximum height it can be lifted without tipping the crane over? (Use 4...
10 of 20 Student A lifts a box of mass m to a height of h. Student B lifts a box of mass 2 m to a height of h/2. Which student exerted the greatest power? Student A Student B Neither student A nor student B (The students exerted the same power.) Not enough information 12 of 20 How much energy is stored in spring that has been compressed 0.20 m if the spring constant is 300 N/m? 9000 J...