7. An object of mass m = 5.00 kg, attached to a spring scale, rests on a frictionless, horizontalsurface as shown in the figure below. The spring scale, attached to the front end of a boxcar,reads zero when the car is at rest.(a) Determine the acceleration of the car if the spring scale has a constant reading of 18.0 Nwhen the car is in motion.(b) What constant reading will the spring scale show if the car moves with constant velocity?(c) Describe the forces on the object as observed (i) by someone in the car and (ii) by someoneat rest outside the car.m

a)Step 1:When the car is accelerating, the spring force has a constant reading of 18N.Let a be the…

Answered: 7. An object of mass m = 5.00 kg,…

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter2: Newton's Laws

Section: Chapter Questions

Problem 10P: . The Kingda Ka roller coaster in New Jersey is the world’s tallest ride of its kind. As the...

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. Under certain conditions, the human body can safely withstand an acceleration of 10 g. (a) What net force would have to act on someone with mass of 50 kg to cause this acceleration? (b) Find the weight of such a person in pounds then convert the answer to (a) to pounds.
A 6.0-kg object undergoes an acceleration of 2.0 m/s2. (a) What is the magnitude of the resultant force acting on it? (b) If this same force is applied to a 4.0-kg object, what acceleration is produced?
. The Kingda Ka roller coaster in New Jersey is the world’s tallest ride of its kind. As the passenger cars are launched from rest at the start, they are accelerated uniformly to a speed of 57 m/s (128 mph) in just 3.5 s. (a) What is the acceleration experienced by passengers on this ride in m/s2? In g’s? (b) If a certain passenger has a mass of 65 kg, what is the force in newtons that acts on him during the launch phase of this ride? What is the force in pounds?
The weight of an astronaut plus his space suit on the Moon is only 250 N. How much do they weigh on Earth? What is the mass on the Moon? On Earth?
4. An elevator (mass 4850 kg) is to be designed so that the maximum acceleration is 0.0680g. What are the maximum and minimum forces the motor should exert on the supporting cable? : blodged or 11.agli 31 voted 4 DAS to mumixa bosted we pad report AS 5. A load whose mass is 15.0 kg is lowered vertically by a rope. In a given instant, the tension in the rope is 170 N. What is the acceleration of the load? Is it UP, or DOWN? el molenst eritti und to y eqot of Jaloud gil-28 a Mil os hosu gniad el eggs A.C entvom al 31 88.8 begin gated walls bris Jas in betite Soxoud ont acol vo M 388 6. A 1200-kg car starting from rest reaches a speed of 60 mi/h meleons edi Felo S.C in 52.0 s. (a) What is its acceleration (m/s²)? (b) What force is acting upon it? ****Note: 1 mi/h = 0.447 m/s
Q19
1. A light string that passes over a frictionless pulley connects two objects with masses m¡=11.0 kg and m2=23.0 kg as shown in the figure. (b) Determine the acceleration of each object. (c) If both objects start from rest, determine their speed after they moved for a first three seconds. (a) Draw the free body diagram for each mass. Zu bto i bna S
20. Suppose a 60.0-kg gymnast climbs a rope. (a) What is the tension in the rope if he climbs at a constant speed? (b) What is the tension in the rope if he accelerates upward at a rate of 1.5 m/s?
madı An elevator together with its passengers weighs 4900 N. At a certain instant, the tension in its supporting cable is 5900 N. Determine the magnitude and direction of its instantaneous acceleration. (g 10 m/s?) O a. 2 m/s?, upward O b. 4 m/s2, downward O c. 4 m/s?, upward O d. 2 m/s?, downward CASES HAIR
9. By what factor does the drag force on a car increase as it goes from 46 to 115 km/h? (Give the percentage increase.) AF Fo Additional Materials O Reading 10. A skydiver weighing 910 N opens his parachute at the appropriate height from the ground. The air exerts a significant upward drag force, which is initially greater than the weight of the diver. This helps to slow the skydiver down. What is the diver's acceleration (both direction and magnitude in m/s?) if the magnitude of the drag force is 1165 N? magnitude m/s? direction -Select-- Additional Materials O Reading 11. During a circus act, one performer swings upside down hanging from a trapeze holding another, also upside-down, performer by the legs. If the upward force on the lower performer is three times her weight, how much (in m) do the bones (the femurs) in her upper legs stretch? You may assume each is equivalent to a uniform rod 30.0 cm long and 1.88 cm in radius. Her mass is 55.0 kg.
A box of mass 100.0kg rests on level ground and there is no friction between the box and theground. Resting on top of that mass is a 40.0kg mass with friction coecient that's unknown. A ropeis tied to the 100.0 kg mass and draped over a pulley from which a third mass hangs. How much massmust the hanging mass have in order for the acceleration of all masses to be 5ms2 ? What is the minimum possible friction coecient of the 40.0kg mass in the prior problem?
mc 1) A cart having mass mc is connected to a hanging mass mp as shown in the figure. When the cart is released from rest, it accelerates towards the pulley. (There is no friction on the table surface or in the pulley. The masses of pulley and the string are negligible. g=9,8 m/s2) For m.=0,25 kg and mp 20gr %D a) What would be the acceleration of the cart ? b) What would be the acceleration if an extra mass of 0.25 kg was placed on the cart?

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