* BIO EST Water striders Water striders are insects that propel themselves on the surface of ponds by creating vortices in the water shed by their driving legs. The velocity- versus-time graph of a 17-mm-long water strider that moved in a straight line was created from a video (Figure P2.76). The insect started from rest, sped up by taking two strides, and then slowed down until it stopped. Estimate (a) the maximum speed (in m/s), (b) the maximum acceleration (in m/s 2 ), and (c) the total displacement (in m) of the water strider. Note that the velocity on the graph is given in units of length of water strider body per second.
* BIO EST Water striders Water striders are insects that propel themselves on the surface of ponds by creating vortices in the water shed by their driving legs. The velocity- versus-time graph of a 17-mm-long water strider that moved in a straight line was created from a video (Figure P2.76). The insect started from rest, sped up by taking two strides, and then slowed down until it stopped. Estimate (a) the maximum speed (in m/s), (b) the maximum acceleration (in m/s 2 ), and (c) the total displacement (in m) of the water strider. Note that the velocity on the graph is given in units of length of water strider body per second.
* BIO EST Water striders Water striders are insects that propel themselves on the surface of ponds by creating vortices in the water shed by their driving legs. The velocity- versus-time graph of a 17-mm-long water strider that moved in a straight line was created from a video (Figure P2.76). The insect started from rest, sped up by taking two strides, and then slowed down until it stopped. Estimate (a) the maximum speed (in m/s), (b) the maximum acceleration (in
m/s
2
), and (c) the total displacement (in m) of the water strider. Note that the velocity on the graph is given in units of length of water strider body per second.
!
Required information
Two chloride ions and two sodium ions are in water, the "effective charge" on the chloride ions (CI¯) is −2.00 × 10-21 C
and that of the sodium ions (Na+) is +2.00 x 10-21 C. (The effective charge is a way to account for the partial shielding due
to nearby water molecules.) Assume that all four ions are coplanar.
CT
Na+
Na+
30.0°
45.0%
с
сг
L.
where a = 0.300 nm, b = 0.710 nm, and c = 0.620 nm.
What is the direction of electric force on the chloride ion in the lower right-hand corner in the diagram? Enter the angle in degrees
where positive indicates above the negative x-axis and negative indicates below the positive x-axis.
A pendulum has a 0.4-m-long cord and is given a tangential velocity of 0.2 m/s toward the
vertical from a position 0 = 0.3 rad.
Part A
Determine the equation which describes the angular motion.
Express your answer in terms of the variable t. Express coefficients in radians to three significant figures.
ΜΕ ΑΣΦ
vec
(t)=0.3 cos (4.95t) + 0.101 sin (4.95t)
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Part A
■Review
The uniform 150-lb stone (rectangular block) is being turned over on its side by pulling the
vertical cable slowly upward until the stone begins to tip.
(Figure 1)
If it then falls freely (T = 0) from an essentially balanced at-rest position, determine the speed at which the corner A strikes the pad at B. The stone does not slip at its corner C as it falls. Suppose that height of the stone is
L = 1.2 ft.
Express your answer to three significant figures and include the appropriate units.
?
ft
VA 10.76
S
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Chapter 2 Solutions
College Physics: Explore And Apply, Volume 2 (2nd Edition)
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