Thursday
November 27, 2014

Posts by lib


Total # Posts: 19

Am. History
As there was after World War II, there is a legitimate threat to Americans and the American way of life in the Post 9/11 world. Senator McCarthy used his influence to weed out suspected Communists from the American government. Are there any lessons to be learned from his ...
April 11, 2014

physics
A man claims he can safely hold on to a 11.90 kg child in a head-on collision with a relative speed of 117. mi/h lasting for 0.140 s as long as he has his seat belt on. (a) Find the magnitude of the average force needed to hold onto the child.
October 15, 2012

physics
Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices. Rank these from easiest ...
October 15, 2012

physics
Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices. Rank these from easiest ...
October 15, 2012

physics
Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices. Rank these from easiest ...
October 15, 2012

physics
A sled loaded with bricks has a total mass of 23.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 12.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.350...
October 10, 2012

physics
Two packing crates of masses 10.89 kg and 2.59 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 2.59 kg crate lies on a smooth incline of angle 40.0°. a) Find the acceleration of the 2.59 kg crate B) find tension in the ...
October 4, 2012

physics
Two blocks each of mass 3.34 kg are fastened to the top of an elevator as in the figure. (a) If the elevator accelerates upward at 1.31 m/s2, find the tensions T1 and T2 in the upper and lower strings. (p4.21a1), enter the answer for T2, the tension in the cable holding the ...
October 3, 2012

physics
A crate of mass 59.3 kg is being transported on the flatbed of a pickup truck. The coefficient of static friction between the crate and the trucks flatbed is 0.357, and the coefficient of kinetic friction is 0.304. (a) The truck accelerates forward on level ground. What is the...
October 3, 2012

physics
A boat moves through the water with two forces acting on it. One is a 2100. N forward push by the water on the propeller, and the other is a 1600. N resistive force due to the water around the bow. (a) What is the acceleration of the 1200. kg boat? (b) If it starts from rest, ...
October 2, 2012

physics
Trevor can row a boat at 3.00 mi/hr in still water. He needs to cross a river that is 1.20 miles wide with a current flowing at 1.60 mi/h. Not having his calculator ready, he guesses to go straight across, he should head 60.0 degrees upstream with respect to straight across. a...
October 2, 2012

physics
a hot-air balloon having initial velocity vi as it ascends. Then, a water balloon is dropped from the basket when it is 135 meters high and would hit the ground after 9.00 seconds. a) find the velocity of the hot-air balloon upon release of the water balloon. The person in the...
October 2, 2012

physics
When baseball players throw the ball in from the outfield, they sometimes allow it to take one bounce before it reaches the infield on the theory that the ball arrives sooner that way. Suppose the angle at which a bounced ball leaves the ground is the same as the angle at ...
September 19, 2012

physics
A rowboat crosses a river with a velocity of 4.23 mi/h at an angle 62.5o north of west relative to the water. The river is 0.543 mi wide and carries an eastward current of 0.73 mi/h. How far upstream is the boat when it reaches the opposite shore?
September 19, 2012

physics
A rowboat crosses a river with a velocity of 4.23 mi/h at an angle 62.5o north of west relative to the water. The river is 0.543 mi wide and carries an eastward current of 0.73 mi/h. How far upstream is the boat when it reaches the opposite shore?
September 19, 2012

physics
A Nordic jumper goes off a ski jump at an angle of 10.0° below the horizontal, traveling 92.0 m horizontally and 47.0 m vertically before landing.; (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ramp
September 19, 2012

Algebra
The owner of a quick oil-change business charges $20 per oil change and has 40 customers per day. If each increase of $2 results in 2 fewer daily customers, what price should the owner charge (to the nearest $2) for an oil change if the income from this business is to be as ...
April 13, 2012

Math
Could someone tell me the rate for a $6000 gift that grew to 7,000,000 over 200 years?
April 9, 2011

Physics
It is not the algebra that is confusing it is setting up the problem
November 7, 2010

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