On the surface of planet x a body with a mass of 10 kilograms weighs 40 newtons. The magnitude of the acceleration due to gravity on the surface of planet X is

Today earths magnetic field is losing approximately 7 percent of its strength every 100 years. If the strength of earth magnetic field at its surface is 0.5 gauss today, what will it be 100 years from now?

A gasoline engine with efficiency 25% delivers 1500 J of mechanical work per cycle. How much heat does this engine discard per cycle? (A) 6000 (B) 7500J (C) 4500J (D) 375 (E) 2000

What are the signs of the angular velocity ω and angular acceleration α of the pulley in case (a) ? by convention, clockwise rotations are negative and counterclockwise rotations are positive?

A 1.80-m string of weight 0.0123N is tied to the ceiling at its upper end, and the lower end supports a weight W. Neglect the very small variation in tension along the length of the string that is produced by the weight of the string.

The relationship between frequency wavelength and speed holds for light waves because

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.

A few years ago, Serena Williams dived to hit a tennis ball right after it bounced off the ground. The ball bounced on the ground 10.3 m from the net, and after Serena hit the ball it flew over the 0.

A force of 1.25x103N is required to lift an object that is under the influence of an acceleration due to gravity of 7.86ft/sec2. What is the object's mass in kilograms?