SIMULATION 02

A bobsled team accelerates the sled to go to 150 m/s in 3 seconds from rest. (a)What is the sled's acceleration? (b) What is the distance the bobsled team traveled?

• (a) 90 m/s

  (b) 235 m

• (a) 50 m/s

  (b) 235 m

• (a) 50 m/s

  (b) 225 m

• (a) 90 m/s

  (b) 225 m

A force of 50 N is applied to a spring with a spring constant of

400 N/m. (a) How far back is the spring compressed? (b) If the force is changed to 90N what will be the new delta x? (c) If the k is changed to 500 N/m, and the spring is compressed to a 0.150 m, how much force should added?

• (a) 0.115 m

  (b) 0.225 m

  (c) 75 N

• (a) 0.125 m

  (b) 0.225 m

  (c) 25 N

• (a) 0.125 m

  (b) 0.225 m

  (c) 75 5

• (a) 0.115 m

  (b) 0.255 m

  (c) 25 N

Answer explanation

The constant of proportionality K is called the spring constant. The negative sign indicates that the force is in the direction opposite to Δ ℓ . A stretched (or compressed) spring contains potential energy; that is, work can be done by the stretched spring when the stretching force is removed

A spring-block system above a frictionless horizontal surface consists of a 200-g block and a spring with a spring constant of

5.00 N/m. The block is displaced 5 cm from the equilibrium point and then is released. What is the frequency and period of the block's motion?

• f=0.9 s^-1

  T=1.25 s

• f=0.8 s^-1

  T=1.45 s

• f=0.8 s^-1

  T=1.25 s

• f=0.9 s^-1

  T=1.55 s

A rod is made to move with a speed of 10.0m/s perpendicular to a 0.40-T magnetic field. The length of the rod is 3.2 m with negligible electrical resistance. The rails also have a negligible electrical resistance. A light bulb has a resistance of 100 ohms. Calculate the emf induced by the rod and the current induced in the circuit.

• e=-3x10^-3 V

  i=0.198 A

• e=19.8 V

  i=0.198 A

• e=-3x10^-3 V

  i=0.128 A

• e=12.8 V

  i=0.128 A

Answer explanation

https://k12.starbooks.ph/pluginfile.php/9933/mod_resource/content/7/index.html

An insulated system takes in 6.5 kcal of heat and a

2000 ] work is being done to it. (a) Convert kcal to J. (b) What is the change in the internal energy of the system?

• a) 27209 J

  b) 29.2 kJ

• a) 29209 J

  b) 28.2 kJ

• a) 29209 J

  b) 29.2 kJ

• a) 27209 J

  b) 28.2 kJ

Answer explanation

https://k12.starbooks.ph/pluginfile.php/9845/mod_resource/content/2/index.html