A skier is traveling fast down a mountain slope. The table shows data collected on the skier at a particular instant.
Mass
64 kg
Weight
608 N
Velocity
21 m/s, forward
Force of skier pushing forward
45 N, forward
Which data are needed to determine the reaction force of the snow pushing
on the skier?
O A. The pushing force and the skier's mass
B. The skier's mass and velocity
C. The skier's weight and acceleration
D. The force of the skier pushing forward

After a car's engine has been running for a while, if you stand near the car's engine you can often feel heat coming from the engine as a result of a. radiation b. convection c. conduction

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l