A group of bikers from LA took 4-hour trip. For the first 3 hours, they traveled a total of 50 km, but during the last hour, they traveled only 10 km. What was the group's average speed for the entire...
A group of bikers from LA took 4-hour trip. For the first 3 hours, they traveled a total of 50 km, but during the last hour, they traveled only 10 km. What was the group's average speed for the entire...
Fred's car travels at a constant acceleration of 5 m/s2 from rest. How long will it have traveled by the time it reaches a velocity of 80 km/h?
John's car is travelling initially at 20km/h and his acceleration is 3.3km/hs. What is its final velocity after 3 hours?
A dragster and driver together have mass 902.2 kg. The dragster, starting from rest, attains a speed of 25.1 m/s in 0.55 s . Find the average acceleration of the drag- ster during this time interval...
An artillery shell is fired with an initial velocity of 300 m/s at 55° above the horizontal. To clear an avalanche, it explodes on a mountainside 42.0s after firing. Whar are the x- and y-coordinates...
1. A man jumps a fence 2.45 m. If the PEg at the top point of his trajectory was 1.59 * 10^3 J, what was his mass? a) 666 kg b) 662 kg c) 66.2 kg d) 26.6 kg 2. You...
A bullet going 153 m/s crashes through a wood plank. After passing through the plank, its speed is 130 m/s. Another bullet, of same mass and size traveling at 92 m/s is also fired at the plank. What...
A 200 N box is pushed up an incline 10 m long and 3 m high. The average force (parallel to the plane) is 120 N. a.) How much work is done? b.) What is the change in the PE of the...
(1) How long does it take a 19 kW steam engine to do 6.8 X 10^7 J of work? a) 1 hr b) 2 hr c) 30 min d) 300 s (2) What is the resultant of a vector that has components...
(1) A 3.00 kg ball is dropped from rest from the roof of a building 176.4 m high. While the ball is falling, a horizontal wind exerts a constant force of 12.0 N on the ball. How long until the ball...
How long does it take (in minutes) for light to reach Venus from the Sun, a distance of 1.184 × 108 km? Light travels at 2.998 × 108 m/s through space. Using this value, determine how...
The height of a golf ball is given by h(t) = -16t2 +48t, where t is the time in seconds and h(t) is the height in feet. A) Why does it make sense that there is no "c"...
Adela throws a softball straight into the air. The ball leaves her hand when it is exactly 5 ft from the ground. The height h of a ball, in feet, can be written as a function of time t, in seconds,...
Eli stands on the balcony of a tall building and throws a tennis ball straight up at a speed of 14 m/s. He releases the tennis ball at a height of 60m from the ground. In parts a through c, round...
Roscoe hit a ball straight up at a speed of 110 ft/sec. His bat hit the ball at a height of 3 feet above the ground. After how many seconds did the ball hit the ground?
A wave on a string is measured to have a node to node segment length of 42 cm when the frequency if 125 Hz. What is the wave speed on the string in meters per second?
I am having trouble showing that the baryon to photon ratio is η= nb/nγ ~ 2.7x10-8Ωbh2 where nb and nγ are the number density of baryons and photons respectively, Ωb is the baryon...
physics question using free body diagram
physics question using free body diagrams
physics question using free body diagram and labeling arrows with the forces asked to calculate