shaknocka

A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 3.24 s after the stone is dropped. How deep is the hole?

A woman and her dog are out for a morning run to the river, which is located 3.51 km away. The woman runs at 3.48 m/s in a straight line. The dog is unleashed and runs back and forth at 5.50 m/s between his owner and the river, until she reaches the river...

A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the intersection is 21.3 m. The plane decelerates through the intersection at a rate of 5.33 m/s2 and clears it with a final speed...

A dynamite blast at a quarry launches a rock straight upward, and 2.0 s later it is rising at a rate of 15 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b)4.2 s after launch.

determine the amounts of solute and solvent needed to prepare the following solutions. 2.0 M aqueous NaCl solution 1.0 m aqueous KCl solution 25% by mass aqueous MgCl2 solution

115 grams of KCl is dissolved in 750 ml of water. what are the molality, molarity, mole percent, % mass, ppm by mass. what would the freezing point and boiling point of that solution assuming Kf of water is 1.86 degree celsius/m and Kb is .0512 degree cel...

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.9 × 104 kg, and the force causes its speed to change from 7600 to 5400 m/s. (a) What is the work done by the f...

Starting at the top of a steep, icy track, a rider jumps onto a sled (known as a skeleton) and proceeds - belly down and head first - to slide down the track. The track has fifteen turns and drops 104 m in elevation from top to bottom. (a) In the absense...

The vertical surface of a reservoir dam that is in contact with the water is 200 m wide and 14 m high. The air pressure is one atmosphere. Find the magnitude of the total force acting on this surface in a completely filled reservoir. (Hint: The pressure v...

i put that water neeed to be mix to lower the freezing point temp and not to damage the radiator

i got the right answer right for acceleration ... to find the total displacement i did 8.75 times 20.11 but its not the right answer

i found the the speed for (a) of when it was launch.. i calculate it from the formula .. v(t)= V+g(t) V=15+9.8(2)=34.6 but how do i calculate it for (b) i tried plugging in 4.2 but i didn't work

how do i find the velocity 4.2s after lunch

force will be -7.007E11/1.9E6 then?

i found that part a) is 45.1 m/s but i don't kno how to find part b)