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Physics
Physics
High School
The engine of a car is developing a power of90kW when it is moving on a horizontal road ata constant speed of 100kmh. Estimate the totalhorizontal force opposing the motion of the car.
Physics
High School
A 2100-kg car is traveling at 25 m/s when it crashes into the rear end of a 1650-kg car traveling at 21 m/s in the same direction on nearly frictionless ice. The two cars become stuck together and slide on the ice. How fast do the two cars move together immediately after the collision?.
Physics
High School
In a certain process, the energy change of the system is 250 kj. The process involves 480 kj of work done by the system. Find the amount of heat q transferred in this process.
Physics
High School
In both prokaryotes and eukaryotes, gene regulation most commonly occurs at the level of ______ initiation. transcription.
Physics
High School
Noise cancelling headphones" are a kind of headphones which decrease the amount of background noise that get into your ears when you wear them. A On what physical phenomena do these headphones depend on?
Physics
High School
a floating leaf oscillates up and down two complete cycles in one second as a 10-meter long water wave passes by. what is the wave's speed?
Physics
High School
the length of the sliding rod is 0.1 m and its speed is 2.0 m/ and b is 0.60 t. a) if the total resistance of the loop is 0.05 , what is the induced current,
Physics
High School
A newly discovered planet is found to have density 2pE and radius (RE/2)where pE and RE are the density and radius of Earth, respectively. The surface gravitational field of the planet is most nearlyA. 2.5 N/kgB. 40 N/kgC. 10 N/kgD. 5 N/kg
Physics
College
9. Which Lewis structure represents a molecule with a bent geometry?
Physics
High School
a railroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the kinetic energy of the system
Physics
High School
How have advances in genetic testing and blood typing helped mitigate the effects of bloodreactions and diseases for many people?
Physics
High School
What would happen if an igneous rock was first exposed to energy from the Earth's interior and then millions of years later to energy from the sun?
Physics
High School
A train accelerates from 30 km/h to 45 km/h in 15. 0 seconds. Find its distance if it travels during this time.
Physics
High School
In your own words, describe how an object's potential energy can be affected by its position.
Physics
High School
what event made it possible for photons to begin to travel freely through the universe when the universe was about 380,000 years old?
Physics
High School
a car goes around a curve with a radius [r] at a constant speed (v). then it goes around the same curve at a speed of 2v (doubled velocity) what is the centripetal force on the car as it goes around the second curve, when compared ot the first curve?
Physics
High School
what is a resultant vector
Physics
High School
as a baseball is being caught, its speed goes from 30.0 m/s to 0.0 m/s in about 0.0050 seconds. the mass of the baseball is 0.145 kg. what is the baseballs' accelerations? what are the magnitude and direction of the force acting on it? what is the magnitude and direction of the force acting ont he player who caught it?
Physics
High School
when a heavy metal block is supported by a cylindrical vertical post of radius r, it exerts a force f on the post. if the diameter of the post is increased to 2r, what force does the block now exert on the post?
Physics
High School
Electrical energy is used to turn the blades of a fan. The amount of energy transformed is seen here: 750 j electrical energy is transformed into 400 j kinetic or mechanical energy. What happened to the remaining 350 j of energy?.
Physics
High School
the gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil
Physics
High School
a 12 h inductor carries a current of 2.0 a. at what rate must the current be changed to produce a 60 v emf in the inductor?
Physics
High School
the heaviest invertebrate is the giant squid, which is estimated to have a weight of about 0.34 tons spread out over its length of 33 feet. what is its weight in newtons?
Physics
High School
Racing on a flat track, a car going 32m/s rounds a curve 56m in radius. What isthe car's centripetal acceleration?
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