) Listen A horizontal force of 73.0 N accelerates a 5.40 kg mass, from rest, at a rate of 1.00 m/s2 in the positive x direction. What is the magnitude of the friction force (in N) that acts on the mass? Vaur Answer:
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- Moments after making the dreaded decision to jump out the door of the airplane flying at 10,682 feet, a skydiver's 85.4-kg body experiences 116 N of air resistance. The m/s?. magnitude of the skydiver's downward acceleration at this instant in time is Use the approximation g = 10 m/s?. LFBD skydiver small air res.png9. A train pulls out of a station along straight with a horizontal track five identical freight cars behind it, each of which weighs 90.0 KN. The train 25.0 m/s reaches a speed of within 5.0 mins. Of starting out. Assuming the engine pulls with a this interval, with a magnitude of a force does the coupling between cars pulls forward on the last of the freight cars? Ignore air constant force during resistance and friction the freight cars. a. 733.94N c. 45, 871.56N b. 458.72N d. 2.30KN d. 459 KNA 2700 kg car traveling to the north is sloweddown uniformly from an initial velocity of 36.6m/s by a 6810 N braking force acting oppositethe car’s motion.a) What is the car’s velocity after 2.19 s?Answer in units of m/s. b) How far does the car move during the 2.19 ss?Answer in units of m. c) How long does it take the car to come to acomplete stop?Answer in units of s.
- different. e. There is not enough information to draw any conclusions regarding distance and displacement. 7. If a car is travelling, north with a constant speed of 25.0 m/s, what is the net force that acts on the car? a. EF = 9.80 N b. ΣF-0 C. EF =-9.80 N d. EF = 25.O N e. We cannot draw any conclusions about the force because we do not know the mass of the car. 8. If a fly collides with a windshield of a fast-moving car, which experiences impact force with a larger magnitude? a. The fly. b. The car. C. Both experience the same force. d. Depends whether the car isla Ford or a Holden. e. None of the above. Page 13 of 16 Assessment 3 of Semester 2, 2021 PHYS0004 Fundamentals of Physics 9. Select the most true statement from the following: a. Joule (J) is a unit of work. b. Joule (J) is a unit of energy. c. Joule (J) is a unit of power.A rocket with a mass of 1 ton is launched vertically. Its initial speed at T = 0 is 1200 km/h, its friction with the air is 200N. Find. a) Differential equation in terms of b, m and g. b) The solution of the differential equation for V. c) The value of the velocity with t= 1 min, 2 min.Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can only withstand about 1.3 kN. If a 140g baseball strikes your head at 30 m/s and stops in 0.0015 seconds, what is the magnitude of the balls deceleration? Express your answer in meters per second squared
- A cyclist is coasting at 18 m/s when she starts on a 450 m long slope that is 40 m high. The cyclist and her bicycle have a combined mass of 75 kg. A steady 15 N drag force due to air resistance acts on her as she coast all the way down to the bottom. a) Draw a useful picture depicting this situation. Clearly label all lengths and relevant vector quantities (velocity, force). b) How much enercy does the cyclist have at the top of the slope? c) How much work does the drag on the cyclist as she goes down the slope? Clearly indicate sign of work. d) What is the cyclist's speed at the bottom of the slope?A 9 kg object undergoes an acceleration given by a (4î - 3j) m/s? The magnitude of the resultant force acting on the object equals: %3D a. 2025 N Ob.9 N OC. 45 N Od. 225 N41. A woman driving a 2000 kg car at 15 m/s fully applies the brakes 50. m from a stoplight. If the car stops 5.0 m before the light, what is the magnitude of the average force applied by the brakes?A. 4100 NB. 4500 NC. 5000 ND. 45000 N
- A car is traveling at 30 m/s along a horizontal road. The coefficients of friction between the road and the tires are μₛ = 0.5 and μₖ = 0.3. How far does the car travel before stopping if the car is braked hard with no antilock braking system so that the wheels lock?a. 100 mb. 120 mc. 153 md. 167 mN7. An elevator of mass 890 kg has an upward force of 1.10 x 10ªN applied to it. Determine the following: a) the net force on the elevator. b) the acceleration of the elevator. (ANS: a) 2.23 x 10³ N b) 2.56 m/s²) 18. In a competition, a small robot accelerates forward at 0.25 m/s² as it pushes a wood a = 0.25 m/s² block of mass 1.6 kg towards a basket. A friction force of 3.7 N exists between the block and floor. a) What is the net force acting on the block? b) What force is the robot applying to accelerate the block? (ANS: a) 0.4 N b) 4.1 N) a = 0.25 m/s? 000 9. A hoist is used to lift a 780 kg car upward with an acceleration of 0.110 m/s². a) What is the net force acting on the car? b) What force was used to lift the car? (ANS: a) 86 N b) 7.73 x 10³ N) a 0.11 m/s Wigh seA cyclist is travelling at 21 km/h when she sees a stop sign ahead. She applies the brakes and comes to a stop in 15 m. The mass of the cyclist and the bike is 73 kg. a. Calculate the acceleration of the cyclist. b. Determine the coefficient of friction between the road and the bike tires.