Force problem

The only force acting on a 2.4 kg body as it moves along the x axis varies as shown in Fig. 7-33. The velocity of the body at x = 0 is 4.0 m/s. (a) What is the kinetic energy of the body at x = 3.0 m? (b) At what value of x will the body have a kinetic energy of 8.0 J? (c) What is the maximum kinetic energy attained by the ...continues

Kinetic Energy Problem

As Fig. 8-44 shows, a 4.5 kg block is accelerated by a compressed spring whose spring constant is 640 N/m. After leaving the spring at the spring's relaxed length, the block travels over a horizontal surface, with a coefficient of kinetic friction of 0.25, for a distance of 5.9 m before stopping. (a) What is the increase in ...continues

Work Problem

In Fig. 8-26, a frictionless roller coaster of mass m = 587 kg tops the first hill with speed v0 = 4.5 m/s. Assume that the first hill is h = 49 m tall. (a) How much work does its weight do on it from that point to point A? (b) How much work does its weight do on it from that point to point B? (c) How much work does ...continues

Instantaneous center of rotation in plane motion

Please see attachments Ans. a).5 m to right of A. b) .1667 m/sec up

Instant center of rotation in plane motion

Please see attachments ans. a) 1.333 in. above A; b) 085 ft./sec. right. c) 60.2 ft. / sec. @48.4 deg.

Two rods AB and DE are connected as shown in the attached figure. Knowing that point B moves downward with velocity 1.2 m/s determine the instant shown the a) angular velocity of each rod (b) velocity of point E

Two rods AB and DE are connected as shown in the attached figure. Knowing that point B moves downward with velocity 1.2 m/s determine the instant shown the a) angular velocity of each rod (b) velocity of point E

Absolute and rel accel in plane mot.

Please see the attached files for full problem description.

Instant center of rotation in plane motion

Please see attachments ans. a)12in/sec^2 to right; b)9.90 in./sec^2 @14 deg down left.

Instant center of rotation in plane motion

Please see attachments 3rd attachmnent describes desired method Ans. ((b^2 w cos(1+sintheta))/(sqrt(l^2-b^2(1+sintheta)^2))) -bw sintheta up

Projectile from ground level.spends what % of total flight time above a roof of known height?

A rock is thrown upward from ground level with initial velocity Vo, beside a building whose roof height is H. In terms of Vo, H and g, find what percent of its total flight time the rock is above the roofline.