For the position-time graph of an object moving in one dimension, which of * 1 point the following properties would imply that the object has motion with nonuniform velocity? a) The graph is a straight line with a slope of 3. O b) The graph is a curve. c) The graph is a horizontal line. O d) The graph is a negative line An object accelerates at a rate of 1.2 m/s2 [W] for 2.0 s and has an initial * 1 point velocity of 5.0 m/s [E]. What is its final velocity? a) 1.4 m/s [E] O b) 2.6 m/s [E] O c) 6.2 m/s [W] O d) 7.4 m/s [W] f you were to find the area under a velocity-time graph, which of the * 1 point following quantities would you be calculating? a) displacement b) instantaneous velocity c) average acceleration d) time A plane has to steer off course to go around a large storm. In doing so it * 1 point travels 60.0 km [N] and 75 km [E]. What is the displacement of the plane after travelling off course? a) 135 km [N 41' E] b) 121 km [S 51' E] O c) 112 km [N 59' E] O d) 96 km [N 51' E]A projectile is launched with an initial velocity of 42 m/s at an angle of 70 * 1 point with the horizontal. What is its initial vertical velocity? a) 49 m/s [up] O b) 39 m/s [up] c) 24 m/s [up] d) 14 m/s [up] What is the net force experienced by a 20.0 kg object that accelerates at a * 1 point rate of 4.0 m/s^2 ? O a) 80 N b) 60 N C) 800 N ( d) 5.0 N A child jumps off a skateboard. What can be said of the force of the * 1 point skateboard pushing on the child? O a) It is smaller in magnitude than the force of the child pushing on the skateboard and opposite in direction. O b) It is equal in magnitude to the force of the child pushing on the skateboard but opposite in direction. O c) It is equal in magnitude to the force of the child pushing on the skateboard and in the same direction. O d) It is greater in magnitude than the force of the child pushing on the skateboard and opposite in direction. Two blocks, at 4.0 kg and 5.0 kg, are suspended from the ceiling by a piece * 1 point of string. What is the tension in the string? O a) 9.ON b) 88 kg C) 88 N O d) 49 NIn which of the following scenarios is Earth's gravitational field strength the * 1 point least? a) standing at sea level at the equator ( b) on top of a mountain near the equator O c) in a space station in orbit ( d) a kilometer underneath a seabed A person is sliding a 12.0 kg block across ice that has a coefficient of * 1 point kinetic friction of 0.100. How much force does the person need to apply to keep the block moving at a constant rate? a) 11.4 N ( b) 12.2 N O C) 11.8 N O d) 12.0 N According to the law of conservation of energy, which of the following is * 1 point true? a) Since the Big Bang the amount of energy in the universe has been increasing. O b) Energy only disappears during nuclear reactions. O c) When an energy transformation occurs, no energy is lost. ( d) Energy can be created out of space. What power input is needed for a 70.0 kg person to go up 5.00 m of stairs * 1 point in 2.00 s? ( a) 3430 J ( b) 175 J O c) 1720 J ( d) 340 JThe specific heat capacity of a substance measures which of the following? * 1 point O a) the amount of energy required to raise the temperature of 1 L of the substance by 1 ' C O b) the amount of energy required to change the state of matter of the substance from liquid to gas c) the amount of energy required to raise the temperature of 1 kg of the substance by 1 'C ( d) the amount of energy required to o bring the substance into a plasma state The amount of energy released or absorbed by a substance during a phase * 1 point transition is called O a) latent heat b) specific heat ( c) phase heat O d) transition heat How does the atomic number of an element change when it undergoes * 1 point alpha decay? a) increases by 1 O b) decreases by 1 c) increases by 2 O d) decreases by 2 A vuvuzela supports a wave with a frequency of 235 Hz. If the wave travels * 1 point at 335 m/s, what is its wavelength? ( a) 0.7 m O b) 1.4 m c) 14 cm d) 100 mWhen two waves meet, one with amplitude 4 cm and the other with * 1 point amplitude 2 cm, what are the possible maximum and minimum amplitudes of the resulting wave? ( a) maximum 6 cm, minimum 2 cm O b) maximum 4 cm, minimum 2 cm c) maximum 8 cm, minimum 0.5 cm ( d) maximum 6 cm, minimum 6 cm Which of the following is the wavelength of the third harmonic of a 33 cm * 1 point long violin string? O a) 11 cm b) 16.5 cm ( c) 22 cm ( d) 33 cmThree children are throwing a disc in the park. The first child throws the * 4 points disc 18 m [W 23' S] to the second child, who then throws the disc 19 m [E 62' S]. What is the net displacement of the disc? Your answer O This is a required question A catapult launches a watermelon from a height of 80m to a target located * 4 points on the ground. The watermelon leaves the catapult moving at 100 km/h at an angle of 40. How long is the watermelon in the air for? Your answer This is a required question Determine the tension cable 1 and 2 if the mass of the block is 100kg, * 4 points FT3 = 120N, the angle formed by rope 3 is 56 degrees and the system is at rest. FT3 Fri FT2 Your answer This is a required question The cart in the image below has a mass of 0.4 kg and is attached, by a * 4 points string and a pulley, to a weight that has a mass of 0.20 kg. Calculate the acceleration of the cart, assuming there is no friction 0.4 kg 0.20 kg Your answerA 170.0 g sample of a substance is heated to 120.0 *C and then plunged * 4 points into 200.0 mL of water at 10.0 *C. The resulting mixture has a temperature of 12.6 *C. What is the specific heat capacity of the substance? Your answer O This is a required question Calculate the mass defect and binding energy of the iron-56 nucleus with * 4 points atomic mass 55.934 937 5 u Your answer This is a required question An air column with a length of 125 cm is left outside on a hot summers * 4 points day (330C). What frequency tuning fork will resonate the fifth harmonic for this vibrating air column. Assume the air column is open at one end and closed at the other. Your answer This is a required question A stereo makes a high-pitched noise () = 8cm) when the temperature of * 4 points the air is T = 25 C. The noise can be heard underwater from a nearby pool. The speed of sound in water is 1480 m/s. Calculate the wavelength of the sound in water and the frequency of the noise in the air? Your answer O This is a required questionDescribe the three main-types of nuclear decay discussed in class. How is * 4 points the conservation of mass maintained if these types of reactions create a mass defect. Your answer An autofocus camera used indoors sends out a pulse of sound and * 4 points measures the time taken for the pulse to reach an object, reflect off it, and return to be detected to set the focus. If the camera is taken outdoors, where the temperature is cold, can the temperature affect the camera's focus? Explain your answer. Your answer Choose one thing discussed in class that you would like to learn more * 4 points about and explain why you are interested in that topic. Your