Chapter 2: Q50PE (page 84)
A kangaroo can jump over an object 2.50 mhigh.
(a) Calculate its vertical speed when it leaves the ground.
(b) How long is it in the air?
Short Answer
a)
b) 1.43 s
Chapter 2: Q50PE (page 84)
A kangaroo can jump over an object 2.50 mhigh.
(a) Calculate its vertical speed when it leaves the ground.
(b) How long is it in the air?
a)
b) 1.43 s
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Get started for freeConstruct the displacement graph for the subway shuttle train as shown in Figure 2.18(a). Your graph should show the position of the train, in kilometres, from t = 0 to 20 s You will need to use the information on acceleration and velocity given in the examples for this figure.
Blood is accelerated from rest to 30.0 cm/s in a distance of 1.80 cm by the left ventricle of the heart. (a) Make a sketch of the situation. (b) List the knowns in this problem. (c) How long does the acceleration take? To solve this part, first identify the unknown, and then discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking your units. (d) Is the answer reasonable when compared with the time for a heartbeat?
An object that is thrown straight up falls back to Earth. This is one-dimensional motion.
(a) When is its velocity zero?
(b) Does its velocity change direction?
(c) Does the acceleration due to gravity have the same sign on the way up as on the way down?
In World War II, there were several reported cases of airmen who jumped from their flaming airplanes with no parachute to escape certain death. Some fell about 20,000 feet (6000m), and some of them survived, with few life-threatening injuries. For these lucky pilots, the tree branches and snow drifts on the ground allowed their deceleration to be relatively small. If we assume that a pilot’s speed upon impact was 123 mph (54 m/s), then what was his deceleration? Assume that the trees and snow stopped him over a distance of3.0m.
(a) Explain how you can determine the acceleration over time from a velocity versus time graph such as the one in Figure 2.56.
(b) Based on the graph, how does acceleration change over time?
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