Friday
December 6, 2013

# Posts by Dan

Total # Posts: 842

math
an object released from rest will fall 16t^2 feet, t seconds after it is dropped. 2 pebbles are dropped, one after the other, from a cliff that is 64 feet high. the 2nd pebble is released the instant the first pebble has fallen exactly one foot. how far above the ground is the...

math
consider the equation x^2+kx+1=0 a single fair die(dice)is rolled to determine the value of the middle coefficient, k. the value for k is the number of dots on the upper face of the die. what is the probability that the equation will have real, unequal roots?

Physics
A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? Equation to use?

Physics
A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? What equation would I use for this?

trigonometry
Suppose θ is an angle in standard position whose terminal side lies in Q II. If sin θ = 13 12 , find sec θ.

physics
An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?

physics
An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?

physics
A river flows due east at 2.00 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.0 m/s due north relative to the water.

Math
1. b 2. c 3. c 4. a

physics
A 5.21 box sits on a ramp that is inclined at 37.8 above the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.29. What horizontal force is required to move the box up the incline with a constant acceleration of 4.00 ?

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