You are driving your car on a straight road with a coefficient of friction between the tires and the road of 0.61. A large piece of debris falls in front of your view and you immediately slam on the brakes, leaving a skid mark of 20.8 m (68.2 feet) long before coming to a stop. A policeman sees your car stopped on the road, looks at the skid mark, and gives you a ticket for traveling over the 17.9 m/s (40 mph) speed limit. Will you win if you fight the speeding ticket in court?By what margin of speed (in m/s) were you traveling over or under the speed limit?

Ingrid wrote the hypothesis below. if the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart. what are the variables in her hypothesis?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.