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1. You are in a kayak which can move at a velocity of 2.6 m/s when in still water. You are attempting to cross a river which is 110 across and which is flowing to the East at a speed of 0.4 m/s. You head directly North across the river.
a. How long does it take you to get to the other side?
b. How far downriver are you when you reach the other side of the river?
c. If you now head back upriver, how long does it take you to reach a point on the river opposite from where you started?
2. You are playing raquetball at the rec center. When you are 10 m away from the wall you hit a ball 30 m/s towards the wall at an angle of 30 degrees. Ignore any affects due to air resistance.
a. How long is the ball in the air before it hits the wall?
b. How high above the launch point does the ball hit the wall?
An electron, starting from rest, accelerates through a potential difference of 413 V. What is the final de Broglie wavelength of the electron, assuming that its final speed is much less than the speed of light
A 21 kg block on a horizontal surface is attached to a horizontal spring of spring constant k = 2.3 kN/m, What is the kinetic energy of the block when it has moved 2.0 cm from its point of release
When a guitar string is sounded along with a 439 Hz tuning fork, a beat frequency of 2.00 Hz is heard. What is the frequency of the string
The pilot of an airplane notes that the compass indicates a heading of due west. find direction (measured from west) of the velocity of the plane relative to the ground
When resting, a person has a metabolic rate of about 3.0 105 joules per hour. The person is submerged neck-deep into a tub containing 1.12 103 kg of water at 22.10° C. find the water temperature after half an hour
A 2.3cm high object is located 30cm from a diverging lens, whose focal length is 14cm. What is the height of the image produced by the lens
Westerly winds coming off the Pacific Ocean rise over the Rocky Mountains, what is the surface temperature and relative humidity on the leeward side of the mountains
A typical red blood cell subtends an angle of only 1.8×10^-5 rad when viewed at a person's near-point distance of 25 cm. find the magnitude of the angle subtended by the red blood cell
An oil rig in the gulf is held at its designated drilling location by 3 tugboats. tugboat A oulls with 42000 N straight in the east direction. Tugboat B pulls at an angle of 50 degrees north of west. tugboat C pulls 25 degress west of south. draw ..
A baseball is hit with a speed of 33.0 ms-1 at an angle of 56.0 degrees. It land's on the flat roof of a nearby building with a height of 13 m. If the ball was hit when it was 1.7 m above the ground, what horizontal distance does it travel before it ..
Suppose a particle with mass m is released from rest in a uniform gravity g, write down the relativistic equation of motion and find an expression that gives the relationship between velocity and time
A golf ball strikes a hard, smooth floor at an angle of 24.7 ° and, as the drawing shows, rebounds at the same angle. compute the magnitude of the impulse applied to the golf ball
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