Find the time required to lift the piano from street

Assignment Help Physics

Reference no: EM1313386

Q1. A 4.00 kN piano is lifted by three workers at the constant speed to an apartment 20.9 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 143 W of power, and the pulley system is 75.0 percent efficient (so that 25.0% of the mechanical energy is lost because of friction in the pulley). Neglecting the mass of the pulley, find the time required to lift the piano from street to the apartment.

Q2. A young woman buys a sports car that can accelerate at the rate of 5.47m/s2. She decides to test the car by drag racing with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.47s before Kathy. Stan moves with a constant acceleration of 3.65 m/s2 and Kathy maintains the acceleration of 5.47m/s2.
Find the time it takes Kathy to overtake Stan.

Reference no: EM1313386

Questions Cloud

The distance separating moon and earth is 386000 km : An electric scooter has a battery capable of supplying 140 Wh of energy. If friction forces and other losses account for 60 percent of the energy usage, what altitude change can a rider achieve while driving in hilly terrain, if the rider and scooter..

Most current costs in the income statement : The inventory methods that result in the most current costs in the income statement and balance sheet and In a period of rising prices, the inventory method that results in the lowest income tax payment

Inertia and torque of the rotating bodies : Inertia and torque of the rotating bodies.

Median of the sample or average : Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?

Find the time required to lift the piano from street : A young woman buys a sports car that can accelerate at the rate of 5.47m/s2. She decides to test the car by drag racing with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.47s before Kathy. Stan ..

Calculation of net present value of a machine with salvage : Calculation of Net present value of a machine with salvage value and what is the net cost of the machine for capital budgeting purposes

Information in deciding to open a store : You used this information in deciding to open a store. Your store Explain however has not come even close to these annual sales.

Find the probable role of the monthly report : Find the probable role of the monthly report and What is the controller's responsibility with respect to a president who doesn't know much accounting?

Physiology of apoptosis : Consider you could micro-inject the cytochrome c within the cytosol of the wild-type cells and of cells which were doubly defective for Bax and Bak.

User Account

All Pages