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Physics
Physics
College
In an elastic collision, a 400-kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 3.5 m/s and that of the trailing car is 6.4 m/s. Hint Assuming that the mass of the drivers is much, much less than that of the bumper cars, what are their final speeds
Physics
High School
A sound wave traveling at 340 m/s is generated by a 480 Hz tuning fork. How long is the sound wave?
Physics
High School
A 3.00 kg box sliding west at 2.00 m/s makes an inelastic collision with a second box sliding 1.50 m/s east. Afterwards, they both come to a stop. What was the mass of the second box?
Physics
High School
An image of a car with height of 14 cm occurred in the mirror which is located at a T-intersection.if the car height is 140 cm and the radius of the curvature of the mirror is 60 cm, how far is the car from the mirror?
Physics
High School
Water, H2O ,and methane ,CH4, are both covalent substances . why is water a liquid at room temperature while methane is a gas ? A. Carbon compounds tend to be gases . B. Water has a stronger intermolecular forces
Physics
High School
write some uses of magnetic force
Physics
College
106. Block A, with a mass of 4 kg, is moving with a speed of 2.0 m/s while block B, with a mass of 8 kg, is moving in the opposite direction with a speed of 3 m/s. The center of mass of the two block-system is moving with a velocity of:
Physics
High School
How much Voltage is required to run 0.025 A of current through a 24 resistor? Use AV = IR.A. 960 VB. 0.60 VC. 1.7 VD. 0.0010 V
Physics
High School
How do human activities lead to change in the weather?
Physics
High School
Which model of the universe is the most widely accepted, and what does itpredict?
Physics
High School
A stone is thrown, run a velocity of 15m/s is projected of an elevation of 30 to the horizontal calculate the time rate of flight
Physics
High School
what changes must be done to the wire to increase its conductance.
Physics
College
Thermodynamic Processes: An ideal gas is compressed isothermally to one-third of its initial volume. The resulting pressure will be
Physics
College
State what is meant by a gravitational potential at point A is -170 109 J kg-1.
Physics
College
Some copper wire has a resistance of 200 ohms at 20 degrees C . A current is then passed through the same wire and the temperature rises to 90 degrees C. Determine the resistance of the wire at 90 degrees correct to the nearest ohm assuming the coefficient of resistance is 0.004/degree C at 0 degrees
Physics
College
Explain briefly how solar energy is used to generate electricity This when the energy from the sun is trapped by either sun panel or others. It passes through conventions then we get the energy out as electricity.
Physics
High School
the distance between any two bodies is 10 M and the gravitational force between them is 3.210-m. if the mass of one object is 40 kg, calculate the mass of another body. (And:119.9 kg)
Physics
College
two small spheres assumed to be identical conductors are placed at 30 cm from each other on a horizontal axis. the first S1 is loaded with 12 nC and the second S2 is loaded with -18 nC. make a figure where you need representative.1) determine the electric force exerted by S1 on S2b) determine the electric field created by S1 at the level of s2c) determine the electric potential created by s1 at the level of s2d) determine the electric force exerted by S2 on S1e) determine the electric field created by s1 in the middle of [S1: S2]f) determine the electric field in the middle of [S1: S2]g) determine the electric potential in the middle of [S1: S2]h) determine the electric potential at the level of S1
Physics
College
How much work does a supermarket checkout attendant do on a can of soup he pushes 0.420 m horizontally with a force of 4.60 N? Express your answer in joules and kilocalories.
Physics
High School
In the image below, a free-body diagram represents the forces of several vehicles driving across a bridge. Assume that the bridge is in statio equilibrium and that it has zero weight, and solve for the unknown reaction force A. 10,800 N B. 65,200 N C. 120,200 N D. 53,400 N
Physics
College
What is your angular position 75 seconds after the wheel starts turning, measured counterclockwise from the top? Express your answer as an angle between 0 and 360. Express your answer in degrees.
Physics
College
When a liquid is cooled,the kinetic energy of the particles______. The force of attraction between the particles______,the space between the particles_______
Physics
College
what is the critical angle of light traveling from vegetable oil into water
Physics
College
An capacitor consists of two large parallel plates of area A separated by a very small distance d. This capacitor is connected to a battery and charged until its plates carry charges Q and - Q, and then disconnected from the battery. If the separation between the plates is now doubled, the potential difference between the plates will
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