Q1 A brick with a dimensions 2.Scm length 3.5cm width and Bcm height having a density 120 kg/m The brick is falling down to the earth surface giving potential erergy 500KJ. What is the initial height of the brick if the final position of the brick is en the earth surface?
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- The blade on a snowplow turns the wet snow through an angle of 120∘ but off to one side at 30∘. If the snow has a density of 500 kg/m3, what power is needed to move the blade at 40 mi/h if it scoops snow that is 15-cm deep and 3-m wide? a. 735 hp b. 746 hp c. 766 hp d. 750 hpThree different objects, all with different masses, are initially at rest at the bottom of a set of steps. Each step is of uniform height d. The mass of each object is a multiple of the base mass m: object 1 has mass 4.90m, object 2 has mass 1.46m, and object 3 has mass m. When the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. If the objects are then relocated as shown, what is the new total potential energy of the system? Each answer requires the numerical coefficient to an algebraic 2 expression. Each algebraic expression is given using some 3 combination of the variables m, g, and d, where g is the acceleration due to gravity. Enter only the numerical coefficient. (Example: If the answer is 1.23mgd, just enter 1.23) U g,system mgdA coffee filter of mass 1.5 grams dropped from a height of 1 m reaches the ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, the Earth, and the air. J
- A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules? b. What is the work done by friction, in joules? c. What is the work done by gravity, in joules? d. What is the net work, in joules?When the two atoms are approaching each other, which statement is true about the potential energy of the system and the kinetic energy of the atoms? A. Potential energy decreases and kinetic energy increases b. Potential energy increase and kinetic energy decreasesA 79 kg bike racer climbs a 1400-m-long section of road that has a slope of 4.3° Part A By how much does his gravitational potential energy change during this climb? Express your answer with the appropriate units. AU = O μÅ Value Units ?
- m hich of these statements about geothermal energy is false? A The hot water produced from the geothermal wells can be directly circulated through buildings or pumped through a heat exchanger that transfers the heat to a building. B The major regions of geothermal development are in the most volcanically and tectonically active regions of the world. The hot water produced from the geothermal can also be used to produce electricity in a geothermal power plant. Electricity is generated when geothermal heat produces steam that turns turbines on a generator. The energy is accessed through geothermal wells which are drilled into the Earth's crust at approximately a depth of 3 to 10 kilometers. The heat is extracted with a variety of methods but in most cases is drawn from the earth using water and steam. E Geothermal energy production is safe, cheap, and reliable. It provides consistent power generation, poses no risk to the earth, and produces no emissions. F Geothermal refers to producing…D-E please!What is the best description of gravitational potential energy? a. The energy stored, dependent on the object's height from the ground. b. The strength from a moving object. c. The energy exerted through stretching or squashing an object. d. The strength stored between molecules, in chemical bonds.