Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight.
b. the tension in the rope is equal to her mass times her acceleration.
c. her acceleration is downward at 9.8 m/s2.
d. none of the above.
Question 2
A roller coaster, loaded with passengers, has a mass of 3000 kg; the radius of curvature of the track at the bottom point of the dip is 24 m. If the vehicle has a speed of 18 m/s at this point, what force is exerted on the vehicle by the track? (g = 9.8 m/s2)
a. 2.3 104 N
c. 7.0 104 N
b. 4.7 104 N
d. 1.0 104 N
Child racing at the Naadam festival
Effect of changing a set point for hypothalamic values
Measuring the Head Circumference of an Infant or Small Child
Decimal Point Place Values
Ischemic compression (i.e., direct pressure) to a trigger point in the trapezius muscle.
Child Development, 7th Edition