Mechanics | Relativity Answers

A car is moving at 19.5m/s [E] as it approaches a stop sign. If the driver accelerates at 1.50m/s squared [W] to come to a stop, how far from the stop sign should he be braking ? Please help a homie out y’all

Calculate the size of the stellar aberration effect in Newtonian physics for
light coming straight down at speed c and a telescope moving straight
sideways at speed v. At what angle θ must we point the telescope to see
the star? Hint: In what direction is the light moving in the reference frame
of the telescope? Express θ in terms of v and c. Give the exact value, not
the small v approximation mentioned in the main chapter.

Swimming pool length and width are 20m and 10m what is the area of the pool in (cm )

A car traveled 20 km to the east, then it moved back 10 km to
the west. And finally, it traveled 50 km to the east. what is the car
total displacement?*

b.) Calculate the Q-value of a harmonic oscillator carrying a mass of 30 g and is rotating on a circular path of 1.2 m. (2 marks)

You are driving at the speed of 33.4 m/s
(74.7296 mph) when suddenly the car in
front of you (previously traveling at the same
speed) brakes and begins to slow down with
the largest deceleration possible without skidding. Considering an average human reaction,
you press your brakes 0.437 s later. You also
brake and decelerate as rapidly as possible
without skidding. Assume that the coefficient
of static friction is 0.829 between both cars’
wheels and the road.
The acceleration of gravity is 9.8 m/s2.
Calculate the acceleration of the car in front
of you when it brakes.
Answer in units of m/s2.
Don't round answer

An elevator accelerates upward at 1.2 m/s2.
The acceleration of gravity is 9.8 m/s2. What is the upward force exerted by the
floor of the elevator on a(n) 67 kg passenger?
Answer in units of N.
Don't round answer.

You place a box weighing 218.5 N on an inclined plane that makes a 37.3◦ angle with the
horizontal.
Compute the component of the gravitational force acting down the inclined plane.
Answer in units of N.
Don't round answer.

If an object is not accelerating, how many
forces act on it?
1. 0
2. 2
3. 1
4. 3
5. Unable to determine

When you drop a 0.35 kg apple, Earth exerts
a force on it that accelerates it at 9.8 m/s
2
toward the earth’s surface. According to Newton’s third law, the apple must exert an equal but opposite force on Earth.
If the mass of the earth 5.98 × 1024 kg, what
is the magnitude of the earth’s acceleration
toward the apple?
Answer in units of m/s2.
Don't round answer.