Energy
The first asteroid to be discovered is Ceres. It is the largest and most massive asteroid is our solar system’s asteroid belt, having an estimated mass of 3.0 x 1021 kg and an orbital speed of 17900 m/s. Determine the amount of kinetic energy possessed by Ceres.
What is 4.8 x 1029 J
Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the work done on the car.
What is 2.35 x 105 J
An adult pushes a heavy box with 120 N of force moving the box 3 m in 6 seconds. How much power did this adult produce?
What is 60 W
When will work be 0?
What is when displacement is 0 or when the force and displacement are acting perpendicular to each other
DAILY DOUBLE!
Choose the amount of points you would like to wager. You can wager up to the current amount of points you have. The teacher will only reveal the question after you wager! If you get the answer right, your total increases by the wager amount. If you get the answer wrong, your total decreases by the wager amount.
A 2160-kg car accelerates uniformly from rest to a speed of 13.0 m/s in 4.05 seconds. Determine the average power (in hp) delivered by the engine during these 4.05 seconds. (1 hp = 746 W)
Calculate the spring constant of a spring that stores 100J of energy when compressed 500cm.
What is 8 N/m
Mr. Ricelander uses a rope to hoist a 9.35 kg mallet from the floor to the ceiling at a constant speed of 1.21 m/s for a displacement of 3.70 meters. Determine the work done on the mallet by Mr. Ricelander.
What is 339.38 J
A new conveyor system at the local packaging plan will utilize a motor-powered mechanical arm to exert an average force of 890 N to push large crates a distance of 12 meters in 22 seconds. Determine the power output required of such a motor.
What is 485 W
How are initial mechanical energy and final mechanical energy related?
What is they are the same / they are equal (energy cannot be created or destroyed)
What are the units typically used for gravitational potential energy (PE) kinetic energy (KE) elastic potential energy (EPE) and work?
What is joules - J
A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground.
a. Determine the kinetic energy possessed by the skydiver.
b. Determine the potential energy possessed by the skydiver.
c. Determine the total mechanical energy possessed by the skydiver.
What is...
a.) 1.5 x 105 J
b.) 6.7 x 105 J
c.) 8.1 x 105 J
Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground.
What is 2.6 x 103 J
Carol, who has a mass of 58.5-kg, is doing the Powerhouse lab. Her sole ambition in life is to become a member of the South Horsepower Club. To do so, she must generate a power of 750 Watts. With what time must she ascend the 2.22-meter-high staircase in order for her to become a member of this prestigious club?
What is 1.7 s
How can you INCREASE power?
What is you can decrease the amount of time the work is completed in or you can increase the amount of work completed while keeping the same time.
What are the units typically used for power?
What is watts - W
Lee Ben Fardest (esteemed American ski jumper), has a mass of 59.6 kg. He is moving with a speed of 23.4 m/s at a height of 44.6 meters above the ground. Determine the total mechanical energy of Lee Ben Fardest.
What is 4.24 x 104 J
A 486.2-gram squirrel does 37 pushups, displacing itself by a distance of 13.41 cm for each pushup. Determine the total work done on the squirrel while moving upward.
What is 23.67 J
During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed. Determine the power generated by Jerome.
What is 1.73 x 103 W
An object is in free fall. When does the object have...
a.) the highest amount of KE?
b.) the highest amount of PE?
What is...
a.) right before it hits the ground
b.) right before it begins to fall
Displacement (x) and height (h) will typically have the units...
What is meters - m
Mac and Tosh have a bet. Mac bets Tosh that if Tosh drops a 0.140-kg baseball out the 95.2-meter high hotel window that he will be able to catch it before it lands. Assuming negligible air resistance, what would be the speed of such a baseball just before it strikes his glove?
What is 43.22 m/s
While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute, displacing its center of mass by a distance of 8.5 cm for each pushup. Determine the total work done on the squirrel while moving upward (32 times).
What is 10 J
The Taipei 101 in Taiwan is a 1667-foot tall, 101-story skyscraper. The skyscraper is the home of the world’s fastest elevator. The elevators transport visitors from the ground floor to the Observation Deck on the 89th floor at speeds up to 16.8 m/s. Determine the power delivered by the motor to lift the 10 passengers at this speed. The combined mass of the passengers and cabin is 1250 kg.
What is 2.06 x 105 W
What is the zero line (specifically when discussing gravitational potential energy)?
What is the lowest point an object will travel (in most cases, the ground)
The spring constant (k) will typically have the units of...
What is N/m, Newton-meters