Tommy is working on a physics problem and asks his friend Sarah to check his work. He is to draw a free-body diagram for a man walking to the left and comes up with the following: He reasons, “The man is walking to the left, so the force of friction is acting in the opposite direction. The normal force should be opposite and equal to that of the gravitational force.” Is Tommy correct with his diagram and reasoning? If so, explain. If not, what mistake did he make?

A rocket takes off from Earth's surface, accelerating straight up at 37.2 m/s2. Calculate the normal force (in N) acting on an astronaut of mass 81.4 kg, including his space suit. (Assume the rocket's initial motion parallel to the +y-direction. Indicate the direction with the sign of your answer.)    ?N

A rocket takes off from Earth's surface, accelerating straight up at 45.2m/s2. Calculate the normal force (in N) acting on an astronaut of mass 85.9kg, including his space suit. (Assume the rocket's initial motion parallel to the +y-direction. Indicate the direction with the sign of your answer.) N

Physics student Matt has just learned about Newton's 3rd law of motion. He's considering a car pulling a trailer as shown below. T He thinks that since the tension force forward on the trailer is equal and opposite to the tension force backwards on the car, the net force on the car must be zero and therefore the car can't accelerate. Which one (or more) of the following statements is correct: The tension force forward on the trailer is not the same magnitude as the tension force backwards on the car. Matt has not considered all the forces acting on the car, such as the friction between the wheels and the ground, in order to calculate the net force on the car. The net force on the car is always zero and therefore the car cannot accelerate. Since the 2 tension forces act on different objects you can't add them together to get a “net force" on either object.

A 2004 Prius with a 150-lb driver and no passengers weighs 3071 lb. The car is initially at rest. Starting at t = 0, a net horizontal force Fx(t) in the +x direction is applied to the car. The force as a function of time is given in (Figure 1). The horizontal parts on the graph correspond to 7500 N and 3500 N. For the time interval t = 0 to t = 4.50 s, what is the impulse applied to the car? What is the speed of the car at t = 4.50 s? At t = 4.50 s, the 3500-N net force is replaced by a constant net braking force Bx = -5240 N . Once the braking force is first applied, how long does it take the car to stop? How much work must be done on the car by the braking force to stop the car? What distance does the car travel from the time the braking force is first applied until the car stops?

b. A block of mass m is placed at rest on an inclined plane as shown below. The plane is frictionless and makes the angle with the horizontal as shown. If another force of magnitude P is applied to the block at the known angle as shown, draw the free body diagram for the block and determine what the value of P must be if the block is to remain at rest. P

A rocket takes off from Earth's surface, accelerating straight up at 75.2 m/s. Calculate the normal force (in N) acting on an astronaut of mass 85.4 kg, including her space suit. (Assume the rocket's initial motion parallel to the +y-direction. Indicate the direction with the sign of your answer.) HINT N

Tommy is working on a physics problem and asks his friend Sarah to check his work. He is to draw a free body diagram for a man walking to the left and comes up with the following: He reasons, “The man is walking to the left, so the force of friction is acting in the opposite direction. The normal force should be opposite and equal to that of the gravitational force.” Is Tommy correct with his diagram and reasoning? If so, explain. If not, what mistake did he make? Communication throughout the test will also be evaluated on 1) rounding using significant digits, 2) proper use of units, 3) organization and neatness, and 4) showing all work

Skyler has been assigned the noble task of baby-sitting Casey, his 2-year old brother. He puts a crash helmet on Casey, places him in a red wagon and takes him on a stroll through the neighborhood. As Skyler starts across the street, he exerts a 56.9 N forward force on the wagon. There is a 23.1 N resistance force and the wagon and Casey have a combined mass of 33.1 kg. Construct a free body diagram depicting the types of forces acting upon the wagon (upload this as part of your work to be graded). Then determine the acceleration (in m/s2) of the wagon.

Please help me to answer this. Answer only Number 7