A spaceship is moving away from the earth with a constant speed of 0.80c. The spaceship fires a 28-kg missile with a speed of 0.50c relative to the spaceship

What is the speed of the missile measured by observers on the earth if the missile is fired (a) away from the earth? (b) toward the earth?


(a) 0.93c (b) 0.50c

Physics & Space Science

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Total lunar eclipses always occur

a. at the time of new Moon. b. at the time of full Moon. c. during either equinox. d. during either solstice. e. at the time that the Sun is directly overhead.

Physics & Space Science

What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?

a. 2.8 N b. 1.6 N c. 1.2 N d. 2.0 N e. 0.4 N

Physics & Space Science

A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2. At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time.

What will be an ideal response?

Physics & Space Science

A cat runs along a straight line (the x-axis) from point A to point B to point C, as shown in the figure

The distance between points A and C is 5.00 m, the distance between points B and C is 10.0 m, and the positive direction of the x-axis points to the right. The time to run from A to B is 20.0 s, and the time from B to C is 8.00 s. As the cat runs along the x-axis between points A and C (a) what is the magnitude of its average velocity? (b) what is its average speed? What will be an ideal response?

Physics & Space Science