Answer:
329.6 m/s
Explanation:
The bullet has a projectile motion, consisting of two separate motions:
- A horizontal motion with constant velocity
- A free fall motion (constant acceleration) in the vertical direction
The bullet misses the target vertically by 1 m: this means that 1 m is the vertical dispalcement of the bullet. So we can find the total time of the flight by using the suvat equation
where
s = 1 m is the vertical displacement
u = 0 is the initial vertical velocity
is the acceleration due to gravity
t is the time
Solving for t,
The horizontal motion is at constant speed, which is given by
where
d = 149 m is the distance covered by the bullet
t = 0.452 s is the time taken
Substituting,
Surface mining is the method of removing the overburden parts of the earth which are the earth and rocks. It also involves removal and loading out of the coal, and then placing back the collected earth back into a surface once again. It's also a method that uses equipment or explosives.
Answer:
The two laws of reflection are as follows: ... The incidenct ray, the reflected ray, and the normal to the reflecting interface at the point of incidence all lie in the same plane. 2. The angle of incidence equals the angle of reflection.
Answer:
The minimum force the climber must exert is about 439N.
Explanation:
We use the relationship between friction and normal force to answer this question:
We are given the static coefficients of friction but need to determine the friction force. To do that we consider the totality of forces acting on this hapless gentleman stuck in a chimney. There is the gravity acting downward (+), then there are two friction forces acting upward (-), namely through his shoes and his back. The horizontal force exerted by the climber on both walls of the chimney is the same and is met with equally opposing normal force. Since the climber is not falling the net force in the vertical direction is zero:
The normal force in this equilibrium is about 439N and because we are told that the static friction forces are both at their maximum, this value is at the same time the <em>minimum</em> force needed for the climber to avoid starting slipping down the chimney.
False. It does repeat itself
