Good morning,

can you help me with those questions

1.

AEd The acceleration of a particle is given by as (t) = -2.10 m/s2 + (2.90 m/s' ) t. vor= m/ Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B What will be the velocity at time t = 4.07 s? Express your answer in meters per second. n/s Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Provide Feedback MacBook ProV Part C A hockey puck with mass 0.160 kg is at rest at the origin (x=0) on the horizontal, frictionless surface of the rink. At time t = 0 a If the same force is again applied at t= 5.00 s, what is the position of the puck at t= 7.00 s? player applies a force of 0.250 N to the puck, parallel to the x- Express your answer in meters. axis; he continues to apply this force until t = 2.00 s. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of AED ? Determining acceleration from force. m Submit Previous Answers Request AnswerWhat is FB if the surface is frictionless and all the other quantities are the same? A box of mass 18.0 kg sits at rest on a horizontal surface. The Express your answer with the appropriate units. coefficient of kinetic friction between the surface and the box is 0.300. The box is initially at rest, and then a constant force of FB = 49.4 N magnitude F and direction 35.0 below the horizontal is applied to the box; the box slides along the surface. Submit Previous Answers Correct V Part C What is Fo if all the quantities are the same as in part A but the force applied to the box is horizontal? Express your answer with the appropriate units. HA ? FC = Value Units IInits iV Part A A 6.00 kg box sits at rest at the bottom of a ramp that is 7.00 m long and is inclined at 30.0 above the horizontal. The coefficient of kinetic friction is Ak = 0.40, and the coefficient of static friction What constant force F', applied parallel to the surface of the ramp, is required to push the box to the top of the ramp in a time of 6.00 s? is Hs = 0.43. Express your answer to four significant figures and include the appropriate units. HA F = Value Units Submit Request AnswerPart A Two blocks are suspended from opposite ends of a light rope that passes over a light, frictionless pulley. One block has mass m1 Calculate m1 . and the other has mass m2, where m2 > m1. The two blocks Express your answer with the appropriate units. are released from rest, and the block with mass m2 moves downward 6.00 m in 2.00 s after being released. While the blocks are moving, the tension in the rope is 19.0 N. HA m1 = Value Units Submit Request Answer A Part B Calculate m2. Express your answer with the appropriate units. m2 = Value Units Submit Request Answer4 Part A A racetrack curve has radius 90.0 m and is banked at an angle of 21.0. The coefficient of static friction between the tires and the roadway is 0.400. A race car with mass 1200 kg rounds the curve As the car rounds the curve, what is the normal force exerted on it by the road? with the maximum speed to avoid skidding. Express your answer with the appropriate units. ? n = Value Units Submit Request Answer Part B What is the car's radial acceleration? Express your answer with the appropriate units. O HA ? arad = Value Unitskercise 6.1 - Enhanced - with Solution Part A You push your physics book 1.40 m along a horizontal tabletop with a horizontal push of 2.70 N while the opposing force of How much work does your 2.70 N push do on the book? friction is 0.500 N. Express your answer in joules. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Work done by a constant force. ? Wstudent J Submit Request Answer Part B How much work does the friction force do on the book? Express your answer in joules. OAD ? Wfriction = J Submit Request Answer Part C MacBook Promach work does the normal force from the table do on the w a . Explass your answer In joules. Quest Answer Part E What is the net work done on the book? Express your answer in joules. AEd ? Wnet = JPart A A car is traveling on a level road with speed vo at the instant Use the work-energy theorem to calculate the minimum stopping distance of the car in terms of vo, g, and the coefficient of kinetic friction / between the tires when the brakes lock, so that the tires slide rather than roll. and the road. For related problem-solving tips and strategies, you may want to Express your answer in terms of vo, 9, and uk . view a Video Tutor Solution of Using work and energy to calculate speed. IVO AEQ S = Submit Request Answer Part B By what factor would the minimum stopping distance change if the coefficient of kinetic friction were doubled? VO AEQ SaPart C By what factor would the minimum stopping distance change if the initial speed were doubled? DA AEQ O ? Sc Sa Submit Request Answer Part D By what factor would the minimum stopping distance change if both the coefficient of kinetic friction and the initial speed were doubled? VO AEQ ? 8d SaPart A A block of ice with mass 2.00 kg slides 1.75 m down an inclined plane that slopes downward at an angle of 36.9 below the horizontal. If the block of ice starts from rest, what is its final speed? Ignore friction. Express your answer with the appropriate units. U = Value Units Submit Request Answer Provide FeedbackPart A A child applies a force F parallel to the x-axis to a 6.00 kg sled moving on the frozen surface of a small pond. As the child Use the work-energy theorem to find the speed of the sled at 8.0 m. controls the speed of the sled, the x-component of the force she Express your answer to two significant figures and include the appropriate units. applies varies with the x-coordinate of the sled as shown in figure (Figure 1). Suppose the sled is initially at rest at x = 0. You can ignore friction between the sled and the surface of the pond. HA ? For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Motion on a curved path. U = Value Units Submit Request Answer Figure Part B