air in a 110 -km/h wind strikes head-on the face of a building 50 m wide by 50 m high and is brought to rest. if air has a mass of 1.3 kg per cubic meter, determine the average force of the wind on the building.
when the shuttle bus comes to a sudden stop to avoid hitting a dog, it decelerates uniformly at 3.7 m/s2 as it slows from 9.1 m/s to 0 m/s. find the time interval of acceleration for the bus. answer in units of s.
a 22.0 kg child is riding a playground merry-go-round that is rotating at 40.0 rev/min. what centripetal force must she exert to stay on if she is 0.996 m from its center? (hint: it's more than double her weight).
a machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. what is the average force exerted on the machine gun mount?
what would happen to the two balls if both of them had a non-neutral charge and you slowly increased the mass of the balls?
is an ebb current one where the tide is coming into shore or going away from shore? and in puget sound, is the ebb current traveling north or south?
if you stand on one side of a strike-slip fault and the block on the other side of the fault has moved to your left, this is known as a(n) .
A boat is 4. 0 meters long and 2. 0 meters wide. Its water line is 1. 0 meter from the bottom of the boat; it is submerged to this water line. What is the mass of the boat?.
An airplane departs from la and flies to ny every minutes. The trip takes hours and minutes. An airplane takes off from ny at the same time that one takes of from la and flies to la at the same speed. How many planes does it pass going in the opposite direction?.
A light ray travels through water and reflects off a glass surface back into the water. How do the phases of the incident light and the reflected light compare?.
Solid co2 sinks in liquid co2, and the triple point of co2 is at −56. 4°c and 5. 11 atm pressure. What state of co2 exists at −56. 4°c and 6. 00 atm pressure?.
The presence of unpaired electrons in an atom determines whether or not an atom is attracted to a magnet or not. Are there unpaired electrons in phosphorus atom? if so, how many?.
A 10,000-kg rocket blasts off from earth with a uniform upward acceleration of 2. 00 m/s2 and feels no air resistance. The upward thrust force its engines must provide during this acceleration is closest to.
a hockey puck slides off the edge of a platform with an initial velocity of 20 m/s horizontally. the height of the platform above the ground is 2.0 m. what is the magnitude of the velocity of the puck just before it touches the ground? you can neglect air.
when you slam on the brakes of your car and lock the wheels, the car skids a certain distance on a straight level road before it completely stops. if you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?
