Melissa

I am working with Excel for Mac 2011.

I want to hide all the unused columns but they never end, after Z there is AA, after ZZ there is AAA and so on, so I can ever hide all of them that are empty.

Anyone know how to fix this??

Thanks.

A hockey goalie is standing on ice. Another player fires a puck (m = 0.21 kg) at the goalie with a velocity of +66 m/s

(a) If the goalie catches the puck with his glove in a time of 6.0 X 10^-3 s, what is the average force (magnitude and direction) exerted on the goalie by the puck?

2310 N

(b) Instead of catching the puck, the goalie slaps it with his stick and returns the puck straight back to the player with a velocity of −66 m/s. The puck and stick are in contact for a time of 6.0 X 10^-3 s. Now what is the average force exerted on the goalie by the puck?

The answer is in N, i keep getting -4620 but its wrong, I got part A correct though.

A car is safely negotiating an unbanked circular turn at a speed of 29 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-fourth of its dry-road value. If the car is to continue safely around the curve, to what speed must the driver slow the car?

______m/s

Car A uses tires for which the coefficient of static friction is 1.1 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 20 m/s. Car B uses tires for which the coefficient of static friction is 0.6 on the same curve. What is the maximum speed at which car B can negotiate the curve?

_____ m/s

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38x10^6 m, determine the speed and centripetal acceleration of a person situated at each of the following.

(a) the equator

______ m/s

______ m/s2

(b) a latitude of 25.0° north of the equator

______ m/s

______ m/s2

One kind of slingshot consists of a pocket that holds a pebble and is whirled on a circle of radius r. The pebble is released from the circle at the angle θ so that it will hit the target. The angle phi in the drawing is 34.3°. The distance to the target from the center of the circle is d. (See the drawing below, which is not to scale.) The circular path is parallel to the ground, and the target lies in the plane of the circle. The distance d is one times the radius r. Ignore the effect of gravity in pulling the stone downward after it is released and find the angle θ.

https://www.webassign.net/cj8/5-p-004-alt.gif

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3240-kg space tug and a 6400-kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 450 m apart. How much time does it take for the ship and the asteroid to meet?

Only two forces act on an object (mass = 2.50 kg), as in the drawing. (F = 51.0 N.) Find the magnitude and direction (relative to the x axis) of the acceleration of the object.

a)magnitude m/s2

b)direction ° counterclockwise from the +x axis

A 7.00-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.340. Determine the kinetic frictional force that acts on the box for each of the following cases.

(a) The elevator is stationary.

(b) The elevator is accelerating upward with an acceleration whose magnitude is 2.90 m/s2.

(c) The elevator is accelerating downward with an acceleration whose magnitude is 2.90 m/s2.

A woman stands on a scale in a moving elevator. Her mass is 52.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9380 N. What does the scale read during the acceleration?

A neutron star has a mass of 2.1 x10^30 kg (about the mass of our sun) and a radius of 4.7 x10^3 m (about the height of a good-sized mountain). Suppose an object falls from rest near the surface of such a star. How fast would this object be moving after it had fallen a distance of 0.016 m? (Assume that the gravitational force is constant over the distance of the fall and that the star is not rotating.)

A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The distance between the earth and the moon is 3.85 108 m, and the mass of the earth is 81.4 times as great as that of the moon.

The weight of an object is the same on two different planets. The mass of planet A is only sixty-two percent that of planet B. Find the ratio rA/rB of the radii of the planets.

On earth, two parts of a space probe weigh 13000 N and 7700 N. These parts are separated by a center-to-center distance of 14 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far from any other objects.

A dolphin leaps out of the water at an angle of 33° above the horizontal. The horizontal component of the dolphin's velocity is 6.2 m/s. Find the magnitude of the vertical component of the velocity.

2. Find the value of the derivative of the function at the given point.

f(x) = (x^2 + 6)(8x + 4) at x=2

3.Find the value of the derivative of the function at the given point.

f(x) = 1/8(7 − 4x^2) at x=1

4.) Find the value of the derivative of the function at the given point.

g(x) = (x^2 − 6x + 2)(x^3 − 3) at x=1

Will choose best answer.

I'm doing a design project and creating an ad for the Duck Brand duct tape.

I need help coming up with a headline, tagline, or slogan for the colored and patterned duct tapes...

Any ideas?

Best answer will be chosen for most inspiring ideas.

Thanks!

A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the 34.0° angle. The magnitude of the force applied by each rope is 2900 newtons. Arrange the force vectors tail to head and use the graphical technique to answer the following questions.

http://www.webassign.net/CJ/01_29alt.gif

a) How much force would a single rope need to apply to accomplish the same effect as the two forces added together?

(b) How would the single rope be directed relative to the dashed line?

-along the dashed line

-slightly below the dashed line

-not enough information to decide

-perpendicular to the dashed line

Soccer player #1 is 7.7 m from the goal (see the drawing). If she kicks the ball directly into the net, the ball has a displacement labeled vector A . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive displacements, vector A y and vector A x. What are the magnitude and direction of vector A x and vector A y?

http://www.webassign.net/CJ/p1-34.gif

vector A x:

magnitude= ___ m

direction = ___

vector A y:

magnitude= ___ m

direction = ___

Three forces are applied to an object, as indicated in the drawing. Force F1 has a magnitude of 20.0 newtons (20.0 N) and is directed 30.0° to the left of the +y axis. Force F2 has a magnitude of 17.7 N and points along the +x axis. What must be the magnitude and direction (specified by the angle θ in the drawing) of the third force F3 such that the vector sum of the three forces is 0 N?

http://www.webassign.net/CJ/p1-46.gif

magnitude= ___N

angle= ___ degrees