A baseball pitcher throws a baseball with a speed of 39 m/s. In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released (see the figure(Eigure 1)). Part A Estimate the average acceleration of the ball during the throwing motion. Express your answer using two significant figures.
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- A particle moves along a straight path with an acceleration of a = (4/s) m/s², where s is in meters. Part A Determine the particle's velocity when s = 6 m, if it is released from rest when s = 1 m. Express your answer to three significant figures and include the appropriate units. V= Value Submit μA Provide Feedback Request Answer Units ?4. At the construction site of a tall building, a worker is in an elevator descending at a constant downwards velocity of 5 m/s. When the elevator is 40 meters above ground level, her friend, standing at ground level, tosses a wrench straight upward with an initial speed of 25 m/s. Take the time when the wrench is tossed as t = 0. For this problem, use g = 10 m/s². a. Draw a labeled picture with symbols and all relevant values. Quantities that are different should be given different symbols, for example y, and Yw. b. Graph the velocities versus time of the elevator and the wrench on the same graph. Label axes of the graph (with units). C. At what time does the wrench and the elevator have the same velocity? 20 10 -10 -20 3 4 time (s) d. Which object (the wrench or elevator) is higher when their velocities are the same? By how much is one object higher than the other at this time? (s/u) kaThe position of a ball as a function of time is given by x = (4.3 m/s)t + (-8 m/s²)t². Part A What is the initial position of the ball? Express your answer to two significant figures and include appropriate units. Value Submit Part B µÅ Submit Value Units Request Answer What is the initial velocity of the ball? Express your answer to two significant figures and include appropriate units. μᾶ Units ? Request Answer ?
- A cheetah sees a gazelle running at a constant speed of 12.4 m/s. The gazelle is 15 m ahead of the cheetah. The cheetah starts from rest to chase (with constant acceleration) the gazelle. After 4.2 s the cheetah catches the gazelle. a.)Determine the distance that cheetah traveled before it catches the gazelle. b.) What is the acceleration of the cheetah? c.) What is the cheetah's speed when it catches the gazelle?At highway speeds, a particular automobile is capable of an acceleration of about 1.8 m/s². Part A At this rate, how long does it take to accelerate from 55 km/h to 120 km/h? Express your answer to two significant figures and include the appropriate units.A particle moves along a straight path with an acceleration of a = (4/s) m/s², where s is in meters. ▼ Part A Determine the particle's velocity when s= 7 m, if it is released from rest when s = 1 m. Express your answer three significant figures and include the appropriate units. V= Value Submit 5 Request Answer Units ?
- The acceleration of a bus is given by ax(t) = αt, where α = 1.15 m/s3 is a constant. a. If the bus's velocity at time t1 = 1.05 s is 4.90 m/s, what is its velocity at time t2 = 2.20 s? b. If the bus's position at time t1 = 1.05 s is 6.05 m, what is its position at time t2 = 2.20 s?A speed skater moving across frictionless ice at 7.80 m/s hits a 4.70-m-wide patch of rough ice. She slows steadily, then continues on at 5.20 m/s. Part A What is her acceleration on the rough ice? ΑΣΦ ? m/s²In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80 m/s². Ignore air resistance. Part A A flea jumps straight up to a maximum height of 0.410 m. What is its initial velocity vo as it leaves the ground? Express your answer in meters per second to three significant figures. ▸ View Available Hint(s) 20 2.83 m/s Submit ✓ Correct Part B Previous Answers How long is the flea in the air from the time it jumps to the time it hits the ground? Express your answer in seconds to three significant figures. ► View Available Hint(s) time in air = Submit 1951 ΑΣΦ Previous Answers Request Answer wood ? S
- A rocket, initially at rest on the ground, accelerates straight upward from rest with constant (net) acceleration 44.1 m/s². The acceleration period lasts for time 8.00 s until the fuel is exhausted. After that, the rocket is in free fall. Part A Find the maximum height ymax reached by the rocket. Ignore air resistance and assume a constant free-fall acceleration equal to 9.80 m/s². Write your answer numerically in units of meters. Ymax = V—| ΑΣΦ ? m2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.Part A A motorcycle moves according to the velocity-versus-time graph shown in the figure(Figure 1). Find the average acceleration of the motorcycle during segment A of the motion. Express your answer using two significant figures. ? m/s Submit Request Answer Part B Find the average acceleration of the motorcycle during segment B of the motion. Express your answer using two significant figures. ap = m/s? Submit Request Answer Figure 1 of 1 Part C 15 Find the average acceleration of the motorcycle during segment C of the motion. 10 Express your answer using two significant figures. A 5 ac = m/s? 5 10 15 20 25 Time, t (s) Submit Reauest Answer s/w) a 'Ápoja