Other Physics Answers

12a.A right triangle has a hypotenuse of length 2.00 m, and one of its angles is 35.0°. What are the lengths of the following sides?

(a) the side opposite the 35.0° angle

(b) the side adjacent to the 35.0° angle

14a. A vector A has components A_x = −2.00 m and A_y = 2.50 m.

 Find the magnitude (in m) and the direction (in degrees counterclockwise from the +x-axis) of the vector.

15a.The magnitude of vector A is 29.5 units and points in the direction 330° counterclockwise from the positive x-axis. Calculate the x- and y-components of this vector.

6a.A rectangular airstrip measures 34.50 m by 230 m, with the width measured more accurately than the length. Find the area (in m²), taking into account significant figures.

8.a certain car is capable of accelerating at a rate of 0.57 m/s². How long does it take for this car to go from a speed of 30 mi/h to a speed of 40 mi/h?

 s

9.A certain aircraft has a liftoff speed of 129 km/h.(a) What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 234 m?

 m/s²

(b) How long does it take the aircraft to become airborne?

 s

10.A car accelerates uniformly from rest to a speed of 30.0 mi/h in 11.0 s.

(a) Find the distance the car travels during this time.

 m

(b) Find the constant acceleration of the car.

 m/s²

11. ball is thrown vertically upward with a speed of 30.0 m/s.(a) How high does it rise?

 m

(b) How long does it take to reach its highest point?

 s

(c) How long does the ball take to hit the ground after it reaches its highest point?

 s

(d) What is its velocity when it returns to the level from which it started?

 m/s

A spacecraft is in orbit at an altitude of 100 km above the surface of the moon.

What is its speed? Mmoon = 7.34 x 1022 kg and Rmoon = 1.84 x 106 m

How long will it take a 4.5Ci sample of material to reach an activity level of 0.14Ci if the half-life is 435 years?