a) Assume friction is negligible. Three identical stones are thrown from the roo

Question

a) Assume friction is negligible. Three identical stones are thrown from the roof of a building with the same initial speed vo. One is thrown at angle ? above the horizontal; one is thrown at angle ? below the horizontal; the third is thrown outward along the horizontal. Which statement is true about each of the following quantities:

- vf, the speed with which the stones hit the ground
- x, the distance the stones hit the ground from the base of the building
- t, the time the stones take to hit the ground
The t's are different, but all the vf's and x's are the same The t's and x's are all different, but all the vf's are the same The vf's and t's are different, but all the x's are the same They all have different vf, t and x The vf's and x's are different, but all the t's are the same The vf's are different, but all the t's and x's are the same They have different x's, but all the vf's and t's are the same They all have the same vf, t and x
b) For any mass m, which statement about its potential energy U, kinetic energy K and total mechanical energy Etot is true? K must be positive or zero; U and Etot can be negative U and Etot must be positive or zero; K can be negative K and Etot must be positive or zero; U can be negative K, U and Etot can all be negative U must be positive or zero; K and Etot can be negative K, U and Etot must all be positive or zero Etot must be positive or zero; K and U can be negative K and U must be positive or zero; Etot can be negative The t's are different, but all the vf's and x's are the same The t's and x's are all different, but all the vf's are the same The vf's and t's are different, but all the x's are the same They all have different vf, t and x The vf's and x's are different, but all the t's are the same The vf's are different, but all the t's and x's are the same They have different x's, but all the vf's and t's are the same They all have the same vf, t and x K must be positive or zero; U and Etot can be negative U and Etot must be positive or zero; K can be negative K and Etot must be positive or zero; U can be negative K, U and Etot can all be negative U must be positive or zero; K and Etot can be negative K, U and Etot must all be positive or zero Etot must be positive or zero; K and U can be negative K and U must be positive or zero; Etot can be negative

Explanation / Answer

They all have different vf, t and x K must be positive or zero; U and Etot can be negative

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.