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Robert C
Questions and answers by visitors named
Robert C
Questions (18)
A ball, dropped from rest, cover 2/7 of the distant to the ground in the last 2 seconds of its fall. From what height was the
1 answer
466 views
A car can go from 0 - 60mi/h in 3 seconds during free fall. How long will it take for this same car to go from 0 - 4 mi/h?
This
1 answer
336 views
An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain
3 answers
1,500 views
A car can go from 0 - 60mi/h in 3 seconds during free fall. How long will it take for this same car to go from 0 - 4 mi/h?
This
1 answer
378 views
A person on horseback moves according to the velocity-versus-time graph shown in Figure 2-32. (The vertical axis is marked in
3 answers
2,808 views
***EXTRA CREDIT*** An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow
1 answer
673 views
An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain
2 answers
531 views
A golf ball is struck with a five iron on level ground. It lands 85.0 m away 4.60 s later. What was the magnitude and direction
2 answers
585 views
The "hang time" of a punt is measured to be 4.00 s. If the ball was kicked at an angle of 53.0° above the horizontal and was
3 answers
917 views
Babe Didrikson holds the world record for the longest baseball throw (296 ft) by a woman. For the following questions, assume
4 answers
1,421 views
A soccer ball is kicked with an initial speed of 12.2 m/s. After 0.497 s it is at its highest point. What was its initial
3 answers
481 views
You pull upward on a stuffed suitcase with a force of 118 N, and it accelerates upward at 0.765 m/s2.
What is the mass of the
3 answers
599 views
You pull upward on a stuffed suitcase with a force of 118 N, and it accelerates upward at 0.765 m/s2.
What is the mass of the
2 answers
796 views
On vacation, your 1300 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 1.80 m/s2.
What is the net
3 answers
1,463 views
Paleontologists estimate that if a Tyrannosaurus rex were to trip and fall, it would have experienced an upward normal force of
1 answer
641 views
A baseball player slides into third base with an initial speed of 8.45 m/s.
If the coefficient of kinetic friction between the
2 answers
654 views
Calculate the power output of a 1.0 g fly as it walks straight up a window pane at 2.6 cm/s.
I have no idea how to figure out
2 answers
715 views
Suppose that a simple pendulum consists of a small 66.0 g bob at the end of a cord of negligible mass. Suppose that the angle
9 answers
2,409 views
Answers (4)
Another question, sorry, trying my bests to understand your thinking. I don't see where you knew to multiple L * theta * W. I understand that the 2nd derivative of the equation gives you the Velocity function.
Vmax= (.53m)(.0800rad)(4.30 rad/s) =.182 KE=1/2mv^2 =1/2(.066kg)(.182)^2 =.0011 or 1.09e-03 That doesn't look right to me. what am I doing wrong? ;_;
Where did the Vmax = L*theta*w come from? How do I find theta?
I figured out a) by using w=2pi/T T=1.46 then used T to solved T=(2pi*sq root L/g) L = .53 but I can't figure out an equation to give me the velocity. Any ideas?
