# Search results

1. ### Crossing a River

A swimmer wants to cross a river, from point A to point B. The distance d_1 (from A to C) is 200 m, the distance d_2 (from C to B) is 1500 m, and the speed V_r of the current in the river is 5 km/h. Suppose that the swimmer makes an angle of 45 degrees(0.785 radians) with respect to the line...
2. ### Math substitution help

the problem is shown in the picture i attached. wouldnt i use u = 2sec(\theta) as a sub?
3. ### Constant velocity formula help

can someone tell me what these formulas do? constant velocity(when velocity is constant, which is 0 right?, you use these formulas)... 1.) a(t) = 0 <== when constant velocity, a(t) = 0 right? 2.) v(t) = Vi(what is v(t)? vi = initial) 3.) x(t) = Xi + ViT (what is this formula used for...
4. ### Free fall acceleration flowerpot problem

A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes time 0.420 s to pass this window, which is of height 1.90 m. Question- How far is the top of the window below the windowsill from which the flowerpot fell? Take the free fall...
5. ### Physics book slides off a horizontal

A physics book slides off a horizontal table top with a speed of 1.60m/s . It strikes the floor after a time of 0.440s . Ignore air resistance. the following are given: v(0)=1.60 t= 0.440s ok this is the question Find the height of the table top above the floor. Take free fall...
6. ### Hot Air Balloon Free Fall Question

A hot-air balloonist, rising vertically with a constant velocity of magnitude v=5.00m/s , releases a sandbag at an instant when the balloon is a height h=40.0m above the ground . After it is released, the sandbag is in free fall. 1.) Compute the position of the sandbag at a time 0.165s after...
7. ### U-du or parts

when doing integration, how do you know if you should use u-du substitution or integration by parts if the problem doesnt state it?
8. ### Caculating time

A Honda Civic travels in a straight line along a road. Its distance xfrom a stop sign is given as a function of time t by the equation x(t) = 1.53m/s^2*t^2 - 5.10×10-2 m/s^3*t^3 Question #1. Calculate the average velocity of the car for the time interval t=0 to t1=1.93s. answer is in m/s...
9. ### Emergency Landing

Emergency Landing. A plane leaves the airport in Galisto and flies a distance 155 km at an angle 68.0 Degrees east of north and then changes direction to fly a distance 270 km at an angle 48.0 degrees south of east, after which it makes an immediate emergency landing in a pasture. 1.) When...
10. ### Triangle physics homework

Emergency Landing. A plane leaves the airport in Galisto and flies a distance 155 km at an angle 68.0 Degrees east of north and then changes direction to fly a distance 270 km at an angle 48.0 degrees south of east, after which it makes an immediate emergency landing in a pasture. 1.) When...