Physics

A car travels for 10s at a steady speed of 20 m/s along a straight road. The traffic lights ahead change to red, and the car slows down with a constant deceleration, so that it halts after a further 8s.
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If a car moves 12 km north, 19 km east, and 12 km south, what is its displacement?
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How do you rationalize the tension being used in Tennis Racket strings using the concept of impulse and momentum?
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A train has a mass of 100000 kilograms.if its kinetic energy is 3mj what velocity is it travelling at
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Minh spent the weekend on his Wii and now has carpal tunnel syndrome. His 120 V outlet has an electrical current of 8A. What is the resistance in the Wii?
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Half Time At 3:00 the hour hand and the minute hand of a clock point in directions that are 90.0apart. What is the first time after 3:00 that the angle between the two hands has decreased by half to 45.0?
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A roller coaster works by being hoisted to the top of the highest peak on the track and then released. As the roller coaster car moves along the track the energy gets converted back and forth between kinetic and gravitational potential energy. The entire time the roller coaster car is in motion air friction and friction in the wheels act to oppose the motion of the car. At which point during the ride is the total mechanical energy of the roller coaster car the greatest?a. At the bottom of the first dip in the track when the car is moving the fastest. b. When the car is exactly at half its original height half way through the ride. c. At the top of the highest peak as the very start of the ride. d. At the end of the ride as the car nears the station.
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The _____________ variable is observed, measured, and affected by the independent variable.
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An empty container is filled with helium to a pressure P at a temperature T. Neon, which has atoms that are 5 times more massive than those of helium, is then added to the container until the new pressure in the container is 2P at the same temperature T. The ratio of the average speed of the helium atoms to the average speed of the neon atoms is:_________a. 25 to 1 b. 5 to 1 c. 5to 1 d. 2to 1 E e. 1 to 1
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A 30 gram ball rolls along a flat surface at a constant speed in the same direction over 4 meters in 20 seconds. Which is the speed of theball? (speed = distance = time)A. 0.2 meters per secondOB. 0.5 meters per secondc. 20 meters per secondD. 80 meters per secondPlease answer this FAST!
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An RC circuit consists of a resistor with resistance 1.0 k, a 120-V battery, and two capacitors, C1 and C2, with capacitances of 20.0 F and 60.0 F, respectively. Initially, the capacitors are uncharged; and the switch is closed at t = 0 s. How much charge will be stored in eah capacitor after a long time has elapsed (capacitor one 2.4 x 10^-3 C) (capacitor 2 7.2 x 10^-3 C) and what will the total charge on both capacitors two time constants after the switch is closed? (8.3 x 10^-3)
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a transfer of energy without a transfer of mass describes what?
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What should stainless steel be considered when using it?
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Look at the circuit diagram. A rectangular box of lines with the long horizontal side. The left side has a circle with an X in it. The top side from left has a small circle connected to another small circle by a horizontal line and then a circle with an X in it. The right side from the top has a small circle connected to another small circle by a horizontal line and then a circle with an X in it. The bottom side has a stack of vertical lines, which are from left short, very short, short, very short. What does the diagram show? one battery, two light bulbs, and three resistors one battery, two switches, and three light bulbs one switch, one resistor, and three light bulbs one switch, one light bulb, and three batteries
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The semi-major axis of this ellipse is 8.8 cm, and the distance from one of the foci to thecenter is 4.4 cm. What is the eccentricity of the ellipse?
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PLEASE HELP !!!Which statement correctly describes protons?A. They have no charge and are present in the nucleus of an atom.B. They have a negative charge and travel around the nucleus of an atom.C. They have a positive charge and travel around the nucleus of an atom.D. They have a positive charge and are present in the nucleus of an atom along with the neutrons.
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When an object vibrates it goes back and forth rapidly. How would youdescribe this motion?A: it goes below its starting point and back to its starting point B: it goes passed its starting point in both directionsC: it will go back and fourth foreverD: it actually looks like spikey waves
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place the compass at one pole of the bar magnet click flip polarity in the menu what happens to the bar magnet and the compass needle
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A charge of +3.5 nC and a charge of +5.0 nC are separated by 40 cm. Find the equilibrium position for a -6.0 nC charge.
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A point source emits sound waves with a power output of 135 watts. What is the sound level (in dB) at a distance of 10 m
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PLEASE EXPLAIN IN TWO PARAGRAPHS (A PARAGRAPH IS 4-5 SENTENCES) SOME HEALTHFUL TIPS THAT CAN HELP PREVENT YOU FROM GETTING PHYSICAL FITNESS INJURIES.
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is silver magnetic or not ?
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MY NOTES A spring with a mass of 2 kg has a damping constant 14 kg/s. A force of 3.6 N is required to keep the spring stretched 0.3 m beyond its natural length. The spring is stretched 0.6 m beyond its natural length and then released. Find the position of the mass at any time t. (Assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)
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Calculate the Kinetic energy of: 1. a rabbit weighing 10kg moving at a speed of 5 m/s.
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