Physics, 26.02.2021 03:30 jennywarmJones
16. What is the acceleration of a car that maintains a constant velocity of 55 mi/hr for 10.0 seconds?
a. 0
b. 5.5 mi /hr/s
c. 5.5 mi /s/s
d. 550 mi/hr/s
17. As an object freely falls, it's .
a. speed increases
b. acceleration increases
c. both of these
d. none of these
18. A speedometer is placed upon a free-falling object in order to measure its instantaneous speed during the course of its fall. Its speed reading (neglecting air resistance) would increase each second by .
a. about 5 m/s
b. about 10 m/s
c. about 15 m/s
d. a variable amount
e. depends on its initial speed.
19.Ten seconds after being dropped from rest, a free-falling object will be moving with a speed of .
a. about 10 m/s.
b. about 50 m/s.
c. about 100 m/s.
d. more than 100 m/s.
20. A baseball pitcher delivers a fastball. During the throw, the speed of the ball increases from 0 to 30.0 m/s over a time of 0.100 seconds. The average acceleration of the baseball is m/s2.
a. 3.00
b. 30.0
c. 300.
d. 3000
e. none of these
21. On takeoff, a rocket accelerates from rest at a rate of 50.0 m/s2 for exactly 1 minute. The rocket's speed after this minute of steady acceleration will be m/s.
a. 50.0
b. 500.
c. 3.00 x 103
d. 3.60 x 103
e. none of these
22. When a rock is dropped, it will accelerate downward at a rate of 9.8 m/s2. If the same rock is thrown downward (instead of being dropped from rest), its acceleration will be . (Ignore air resistance effects.)
a. less than 9.8 m/s2
b. 9.8 m/s2
c. more than 9.8 m/s2
Answers: 1
Physics, 22.06.2019 00:20
Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.
Answers: 2
Physics, 22.06.2019 05:30
Will give brainliest! which statement best describes the similarities between fundamental forces? electromagnetic and strong nuclear forces influence the interaction between charged particles within an atom. gravitational and magnetic forces are both types of charges that occur in nature. nuclear and magnetic forces are both related to mass and weight. strong nuclear force is most like electrical force because they are both related to distance.
Answers: 3
Physics, 22.06.2019 06:00
Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire
Answers: 1
16. What is the acceleration of a car that maintains a constant velocity of 55 mi/hr for 10.0 second...
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