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A car starts from rest, then accelerates at 1.20 m/s2 for 7.00 s. It hits the brakes, slowing to a stop at a rate of -4.25 m/s2. ?
A car starts from rest, then accelerates at 1.20 m/s2 for 7.00 s. It hits the brakes, slowing to a stop at a rate of -4.25 m/s2. What is the total distance travelled?
Unit= m
1 AnswerPhysics1 day agoIn a race, Usain Bolt accelerates at 1.99 m/s2 for the first 60.0 m, then decelerates at -0.266 m/s² for the final 40.0 m. ?
In a race, Usain Bolt accelerates at 1.99 m/s2 for the first 60.0 m, then decelerates at -0.266 m/s² for the final 40.0 m. How much time did the race take
1 AnswerPhysics4 days agoAn archer defending a castle is on an 15.5 m high wall. He shoots an arrow straight down at 22.8 m/s.?
An archer defending a castle is on an 15.5 m high wall. He shoots an arrow straight down at 22.8 m/s. How much time does it take to reach the ground?
1 AnswerPhysics4 days agoA car engine burns gas at 495 K, and exhausts to the air at 293 K. ?
A car engine burns gas at 495 K, and exhausts to the air at 293 K. If it ran at the highest possible efficiency and used 10,000 J of input heat, how much heat would be rejected into the air?
Unit=j
Other answers aren’t right
Chemistry5 days agoThe fastest speed a human has ever run was 11.9 m/s.?
The fastest speed a human has ever run was 11.9 m/s. At what temperature would a nitrogen molecule (MM = 0.0280 kg/mol) travel at that speed?
Unit=K
1 AnswerChemistry6 days agoThe coldest temperature ever recorded in the US was -62.1°C (-79.8°F). What was the speed of the nitrogen molecules in the air that day?
The coldest temperature ever recorded in the US was -62.1°C (-79.8°F). What was the speed of the nitrogen molecules in the air that day?
Unit=m/s
R = 8.31 J/(moK)
MM of N2 = 0.0280 kg/mole =
Remember: Temperature must be in K, not
1 AnswerChemistry6 days agoA 1.00 m3 box is filled with 54.1 moles of air (MM = 0.0289 kg/mole). The rms speed of the molecules is 549 m/s.?
What is the pressure of the molecules? Unit = Pa
Physics1 week agoHydrogen molecules in a gas have an rms speed of 3150 m/s. What is their temperature?
Unit=K
1 AnswerChemistry1 week ago0.645 kg of molten silver at its melting point (962°C) is added to 0.800 kg of water at 20.0°C. What is their final equilibrium temperature?
(Don't forget, silver LOSES heat when it
solidifies.) unit= degrees C
No other answers worked
2 AnswersChemistry2 weeks agoEmily makes 0.250 kg of hot tea at 99.0°C.?
Emily makes 0.250 kg of hot tea at 99.0°C. How much ice at 0.00°C must she add to the tea so that the mixture reaches final temperature of 8.00°C? You may treat the tea as if it is water.
(Don't forget, the ice melts to 0°C water, which then warms up to Tf.)
1 AnswerPhysics2 weeks agoAn amount of ice at 0°C is added to an 8.25 kg tub of water at 25.0°C. If their final temperature is 18.2°C, what mass of ice was added?
An amount of ice at 0°C is added to an 8.25 kg tub of water at 25.0°C. If their final temperature is 18.2°C, what mass of ice was added?
(Don't forget, the ice melts to 0°C water, which then warms up to Tf.)
1 AnswerPhysics2 weeks agoA 0.0500 kg ice cube starts at -18.5°C. How much heat does it take to melt it completely?
A 0.0500 kg ice cube starts at -18.5°C. How much heat does it take to melt it completely? (Don't forget, you have to warm it up to the melting point first.) unit=J
1 AnswerPhysics2 weeks agoAn aluminum rod and a nickel rod are both 5.00 m long at 20.0°C. The temperature of each is raised to 70.0°C.?
An aluminum rod and a nickel rod are both 5.00 m long at 20.0°C. The temperature of each is raised to 70.0°C. What is the difference in length between the two rods?
1 AnswerPhysics3 weeks agoA brake pedal cylinder has a radius of 0.00115 m. ?
A brake pedal cylinder has a radius of 0.00115 m. It is connected by a hydraulic line to a piston of radius 0.00290 m that pushes the brake pads. To create 152 N of force on the
pads, what force must the driver exert
on the brake pedal? Unit=N
Physics3 weeks ago