2 A woman pushes a lawn mower with a force of 80 N. If the handle of the lawn mower is 40° above the horizontal, how much downward force is being exerted on the ground? 2.9. An airplane is heading northeast at a velocity of 550 km/h. What is the northward component of its velocity? The

Determine the moment created by the weight of the traffic light about point O. The dimensions of the traffic light post and arm are shown in the accompanying figure. The traffic light weighs 40 lb.

In the design of a supermarket, there are to be several ramps connecting different parts of the store. Customers will have to push grocery carts up the ramps. An engineer has done a survey and found that almost no one complains if the force is no more than 50 N. With a slope equal to 5°, what force must a person exert, assuming a 30 kg grocery cart (full of groceries)? Assume friction (wheels against the ground, wheel on the axle, and so on), can be accounted for by a coefficient equal to 0.10.

mass of the ball at 0.0097 Kg, “r” represents the geometric radius of the ball at 0.01272 m, and “r’” represents the effective rolling radius of the ball at 0.01018 m. Speeds at two points on one of our team's rollercoasters are 3.18 and 3.12 m/s respectively.  The ball leaves the track horizontally at 3.12 m/s following a parabolic path, hitting the ground. Determine the angular speed the ball has when it hits the floor.

Determine the horizontal force required to move a 2500-lb automobile with 23-in.-diameter tires along a horizontal road at a constant speed. Neglect all forms of friction except rolling resistance, and assume the coefficient of rolling resistance to be 0.05 in.

1. A post is supported by a guy wire which exerts a pull of 100 N on the top of the post. If the angle between the wire and the ground is 60 degrees, what is the horizontal component of the force supporting the pole?

A man pulls a rope attached to a sled. If the rope makes an angle of 32° with the ground, determine the force the man must exert on the rope so that the effective force tending to move the sled along the ground is 150 N.

Rear Raised Standard 0.6 m 0.4 m 1.3 m 1.6 m 1.3 m 1.6 m Car image from YouTube.com Newton's Laws (Rigid Bodies): In an attempt to make her car accelerate faster, a drag racer has raised the rear of her car to increase the centre of gravity by 0.2 m. The shift in the horizontal location of the centre of gravity is negligible. The car has a mass of 1600 kg and the coefficient of friction is 0.3. The car is rear wheel drive. The front wheels roll freely. Neglect the mass of the wheels. Neglect the suspension deflection. Assume the front wheels stay on the ground. What is the change in maximum acceleration as a percentage taking the unraised car as the reference?

1. A boy in a wheelchair (total mass 50.0 kg) has a speed 1.40 m/s at the crest of a slope 2.60 m high and 12.4 m long. At the bottom of the slope his speed is 6.20 m/s. Assume air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N. Find the work he did in pushing forward on his wheels during the downhill ride.

Two planes, A and B, are flying at the same altitude. Their velocities are v₁ = 500 km/h and VB = 670 km/h such that the angle between their straightline courses is = 60°. (Figure 1) B VA - 500 km/h Determine the magnitude of the velocity of plane B with respect to plane A. Express your answer in kilometers per hour to three significant figures. Determine the direction angle of the velocity of plane B with respect to plane A, measured counterclockwise from the positive x axis. Express your answer in degrees to three significant figures.