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A laser pointer has a beam intensity of 36 W/m2 and a beam radius of 2.4 mm. A first grader attempts to use it to move a black toy car. Assuming perfect absorption, what is the force on the car?
question1attempting to stop on a slippery road a car moving at 85 skids across a road at a 30 angle to its initial
Two parallel wires separated by 4.3 cm repel each other with a force per unit length of 1.6 multiply.gif 10-4 Nm. Find the current in the other wire
If a car travelling at 52 km/h will skid 18 m when its brakes lock, how far-off will it skid if it is travelling at 120 km/h when its brakes lock.
How much work is done by the outside force in moving the particle from A to B?
A certain lightbulb has a tungsten filament with a resistance of 18.9 ? when at 20.0°C and 139 ? when hot. Find the temperature of the hot filament
Blue light of frequency 6.5 1014 Hz falls on the surface of potassium, which has a work function of 2.26 eV. Find the maximum kinetic energy of emitted electrons.
Electrons are accelerated by a potential and directed upon a thin salt crystal that has inter-atomic spacing of 0.282 cm. What was the acceleration potential
An amazing parent pushes their child's sled (total mass = 65kg) so that the sled is moving at 5 m/s at the top at the sledding hill which makes a 20 degree angle with the horizontal. calculate the speed of the sled
What are the characteristics of longitudinal and transverse waves? Describe their differences and similarities
A 78.3?kg bungee jumper is enjoying an afternoon of jumps. The jumper's first oscillation has an amplitude of 10.3m and a period of 4.75s. find the spring constant of the bungee cord
A bottle containing 3.4 kg (mass) of water at a temperature of 23.4 oC is placed in a refrigerator where the temperature is kept at 3.2 oC
What temperature change would reason a 0.20 % enhance in the volume of a quantity of water that was at first at 20 ^circ {rm C}.
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