At the Earth's surface a 800 kg projectile is launched straight up at a speed of 9.00 km/s. Ignore air resistance and the rotation of the Earth a. What is the projectile's total mechanical energy at Earth's surface? J b. What is the projectile's maximum height (measured from the Earth's surface)? km c. How much work was done by the gravitational field as the projectile moved from the surface to its maximum height? J d. True/False: The projectile's maximum height depends on the projectile's mass? True

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.