PHYS Final

Two vectors, of magnitudes 20 mm and 50 mm, are added together. Which one of the following is a possible value for the magnitude of the resultant?

40 m

A prankster drops a water balloon from the top of a building. If the balloon is travelling at 29.1 m/s when it strikes a window ledge that is 1.5 m above the ground, how tall is the building?

45 m

A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will

be directly over the package

Two planets have the same surface gravity, but planet B has twice the radius of planet A. If planet A has mass m, what is the mass of planet B?

r sqrt(2)

Express (4.3 x 10^6)^(1/2) in scientific notation

4.8 x 10^-4

A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible.

15 m/s

In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?

160 m/s

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water?

2.9 s

Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the speed of the ball at as it passed the top of the flagpole? Neglect air resistance.

23 m/s

In the number 0.00723, the number of significant figures is

3

What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?

3240 N

Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle with a radius of 600 m. At the bottom of the dive, the speed of the airplane is 150 m/s. What is the apparent weight of the 70-kg pilot at that point?

3300 N

The figure shows a block of mass M hanging at rest. The light wire fastened to the wall is horizontal and has a tension of 38 N. The wire fastened to the ceiling is also very light, has a tension of 59 N, and makes an angle 0 with the ceiling. Find the angle 0

50 degrees

The mass of a typical adult woman is closest to

65 kg

On a a calm day with no wind, you run a 1500-m race at a velocity of 4.0 m/s. If you run the same race on a day when you have a constant headwind that slows your speed by 2.0 m/s, how much time would it take you to finish the race?

750 s

Which of the following graphs represent an object at rest?

A (straight line)

A heavy dart and a light dart are launched horizontally on a frictionless table by identical ideal springs. Both springs were initially compressed by the same amount.

A B E

A heavy frog and a light frog jump straight up into the air. they push off in such a way that they both have the same kinetic energy just as they leave the ground. Air resistance is negligible. Which of the following statements about these frigs are correct? (There could be more than one correct choice.)

B. Just as they leave the ground, the lighter frog is moving faster than the heavier frog; F. Both frogs reach the same maximum height

Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r. What is the magnitude of the new gravitational force?

F/4

Two boxes are connected to each other by a string as shown in the figure. The 10-N box slides without friction on the horizontal table surface. The pulley is ideal and the string has negligible mass. What is true about the tension T in the string?

T < 30 N

When adding 350 to 0.23

The answer would be 350

A projectile is thrown upward at 24 degrees with the vertical and returns to the horizontal ground 12.5 s later with no air drag

a. 67 ms b. 340 c. 190 m

The slope of a velocity versus time graph gives

acceleration

A horse pulls a cart with force F. As a result of this force the cart accelerates with constant acceleration. The magnitude

equal to the magnitude of F