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Propose a longitudinal study and a cross-sectional design being sure to identify the independent and dependent variables and discuss how you might be able to avoid the confounding that results from the presence of age in these quasi-experimental designs.
An object is to the left of a thin lens. The lens forms an image on a screen that is 2.60 m to the right of the object. Is the image upright or inverted
A 1300-kg car is being driven up a 4.0° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f = 530 N. A force Farrowbold is applied to the car by the road and propels the car forward.
Dolphins emit ultrasonic waves with a frequency as high as 2.5 105 Hz. What is the wavelength of such a wave in seawater at 25° C
One solenoid is centered inside another. The outer one has a length of 50.0 cm and contains 6750 coils, while the coaxial inner solenoid is 3.0 cm long and 0.120 cm in diameter, Find the emf induced in the inner solenoid
question1on vacation your 1350 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 1.90 ms2.a
A computer memory stick has a power rating of 2.3*10^-4W and is connected to a 1.5V dc power supply for 6.5 hours decide: The total charge that flows through the memory stick through this time. The number of electrons that flow during the memory stic..
A battery and a light bulb are connected in series so a current flows through the light bulb. The battery provides a constant voltage of 12 Volts. What is the current drawn from the battery by the light bulb
An unspecified force causes a 0.1-kg object to accelerate at 0.3 m/s2. If 0.4 kg is added to the 0.1-kg object and the force remains the same.
Four identical charges (+2uC each) are brought from infinity and fixed to a straight line. The charges are located .4 m apart. Determine the electric potential energy of this group.
Two equal charges Q are separated by a distance d. One of the charges is released and moves away from the other due to the force between them. When the moving charge is a distance 3d from the other charge, what is its kinetic energy?
Two bicycle tires are set rolling with the equivalent initial speed of 5.0 m/s along a long, straight road, and distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 {rm psi} and goes the dist..
An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 754 N. what is the weight of the sand and box in that situation
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