this problem. Traveling at a speed of 19.9 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.610. What is the speed of the automobile after 1.24 s have elapsed? Ignore the effects of air resistance. Number i eTextbook and Media Units

One of the complicating factors in analyzing motion is the presence of friction. It is difficult to isolate the effect of friction and to imagine what motion looks like without it. Newton's 2nd law of motion states that a force applied to a mass will cause an acceleration, f = ma. UNLESS THE PROBLEM STATES OTHERWISE, assume the experiments below are performed on a surface of smooth ice so that the effect of friction is negligible. 1) a. Imagine a cube-shaped mass of 100 kg. If two people push it to the right, one with a force of 150 N, and one with a force of 220 N, what acceleration should the cube experience? b. Instead, if one person pushes to the right with a force of 150 N, and the second person pushed to the left with a force of 220 N, what acceleration should the cube experience?

The trap-jaw ant, found throughout tropical South America, catches its prey by very rapidly closing its mandibles around  its victim. Shown is the speed of one of its mandible jaws versus time in microseconds. a. What is the maximum acceleration of the ant’s mandible? b. The mass of a trap-jaw ant’s mandible has been estimated to be about 1.3 x 10-7 kg. Estimate the maximum force exerted by one mandible.

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A test car is driving toward a solid crash-test barrier with a speed of 45 mi/h. Two seconds prior to impact, the car begins to brake, but it is still moving when it hits the wall. After the collision with the wall, the car crumples somewhat and comes to a complete stop. In order to estimate the average force exerted by the wall on the car, what information would you need to collect?  a. The (negative) acceleration of the car before it hits the wall and the distance the car travels while braking.  b. The (negative) acceleration of the car before it hits the wall and the velocity of the car just before impact.  c. The velocity of the car just before impact and the duration of the collision with the wall.  d. The duration of the collision with the wall and the distance the car travels while braking.

The figure shows the velocity graph of a 76 kg passenger in an elevator. (Figure 1) Part A What is the passenger's weight at t =1 s? Express your answer to two significant figures and include the appropriate units. HA ? w = Value Units Submit Request Answer Part B What is the passenger's weight at t = 5 s? Express your answer to two significant figures and include the appropriate units. ? w = Value Units Submit Request Answer Part C What is the passenger's weight at t = 9 s? Express your answer to two significant figures and include the appropriate units. ? w = Value Units Submit Request Answer Provide Feedback Figure V, (m/s) 8- 4 t (s) 10 4 6. 8

A package is dropped from an airplane. It takes 6.5 seconds to reach the ground. Assuming air resistance is not a factor, how fast is the package moving when it hits the ground? Write your answer to the nearest 10th - example XX.X

UD MY UTEP ← → C User Settings X Document Sharing A Mail-Alvarado, X mylabmastering.pearson.com/?courseld=12473856&key=14018101051816159781032023#/ Two packages at UPS start sliding down the 20.0° ramp shown in (Figure 1). Package A has a mass of 2.00 kg and a coefficient of kinetic friction of 0.350. Package B has a mass of 10.0 kg and a coefficient of kinetic friction of 0.110. Type here to search Blackboard Learr x PCourse Home X ℗ 7.3.3: A Strategy × b Answered: Two * G Two packages at x + For help with math skills, you may want to review: Vector Components Figure B A 1 of 1 2.00 m 20.0° W How long does it take package A to reach the bottom? Express your answer with the appropriate units. ► View Available Hint(s) At = Submit 0 Provide Feedback μA Value Units ? 74°F Sunny G✩ 4) 0 Next > 5:55 PM 11/3/2023 D x :

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A block is launched up an inclined plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3. The speed of the block when it reaches the starting position on the trip down: A.) is the same as the launching speed. B.) cannot be compared to the launch speed with the information given. c.) is greater than the launching speed. D.) is less than the launching speed.