Quiz
Kinematics Pretest
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Perguntas do quiz (11)
1A ball is thrown upward with an initial velocity of 20m/s. How long will the ball take to reach its maximum height?
- A19.6 s
- B9.8 s
- C6.3 s
- D2.04 s
2An airplane lands on a runway with a velocity of 150m/s. How far will it travel until it stops if its rate of deceleration is constant at \(-3m/s^{2}\)?
- A525m
- B3,750m
- C6,235m
- D9,813m
3A ball is thrown downward from the top of a roof with a speed of 25 m/s. After 2 s, its velocity will be
- A19.6 m/s
- B-5.4 m/s
- C-44.6 m/s
- D44.6 m/s
4A rocket is propelled upward with an acceleration of \(25m/s^{2}\) for 5 s. After that time, the engine is shut off, and the rocket continues to move upward. The maximum height, in meters, that the rocket will reach is
- A900
- B1,000
- C1,100
- D1,200
5What is the total change in velocity for the object whose acceleration versus time graph is given below?
- A40 m/s
- B-40 m/s
- C80 m/s
- D-80 m/s
6An object has an initial velocity of 15 m/s. How long must it accelerate at a constant rate of 3 \(m/s^{2}\) before its average velocity is equal to twice its initial velocity?
- A5 s
- B10 s
- C15 s
- D20 s
7A projectile is launched at an angle of \(45^{0}\) with a velocity of 250 m/s. If air resistance is neglected, the magnitude of the horizontal velocity of the projectile at the time it reaches maximum altitude is equal to
- A0 m/s
- B175 m/s
- C200 m/s
- D250 m/s
8A projectile is launched horizontally with a velocity of 25 m/s from the top of a 75m height. How many seconds will the projectile take to reach the bottom?
- A15.5
- B9.75
- C6.31
- D3.91
9At a launch angle of \(45^{0}\), the range of a launched projectile is given by
- A\(\frac{v_{i}^2}{g}\)
- B\(\frac{2v_{i}^2}{g}\)
- C\(\frac{v_{i}^2}{2g}\)
- D\(\sqrt{\frac{v_{i}^2}{2g}}\)
10A projectile is launched at a certain angle. After 4 s, it hits the top of a building 500 m away. The height of the building is 50 m. The projectile was launched at an angle of
- A\(14^{0}\)
- B\(21^{0}\)
- C\(37^{0}\)
- D\(76^{0}\)
11A mass attached to a string is twirled overhead in a horizontal circle of radius R every 0.3 s. the path is directly 0.5m above the ground. When released, the mass lands 2.6 m away. What was the velocity of the mass when it was released and what was the radius of the circular path?
- Avelocity = 0.389 m/s; radius = 8.14 m
- Bvelocity = 8.14 m/s; radius = 0.389 m
- Cvelocity = 7.14 m/s; radius = 2.14 m
- Dvelocity = 2.14 m/s; radius = 7.14 m
Informações
- Descrição
- Knowledge pretest on kinematics for Physics II
- Autor
- DC PC
- Idioma
- English
- Visualizações
- 7
- Etiquetas
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