# Physics 20 midterm help plz asap :) !?

1) what is the angle for north 50 degrees west using the x-axis method? a) 50 degrees b) 40 degrees c) 140 degrees d) 130 degrees 2) which of the following if a true statement about speed a) speed has no magnitude but has direction b) speed has both magnitude and direction c) speed has no magnitude and no... show more 1) what is the angle for north 50 degrees west using the x-axis method?
a) 50 degrees
b) 40 degrees
c) 140 degrees
d) 130 degrees

2) which of the following if a true statement about speed
a) speed has no magnitude but has direction
b) speed has both magnitude and direction
c) speed has no magnitude and no direction
d) speed has magnitude but has no direction

3) if the distance around a circular track is 2.0 km and if runners run 3 laps what is the magnitude of the displacement
a) 0 km
b) 6 km
c) 3 km
d) 2 km

4) what is plotted on the horizontal axis of a speed time graph?
a) speed
b) distance
c) time
d) acceleration

5) when the slope of a position time graph gets less steep what is indicated about the instantaneous velocity?
a) the instantaneous velocity is decreasing
b) the instantaneous velocity is staying the same
c) the instantaneous velocity is increasing
c) it is impossible to tell from the info given

6) what info does the area under a speed time graph give
a) speed
b) distance
c) time
d) acceleration

7) if the displacement of a car was 150 km (e) and the velocity was 50.0 km/h (e) what was the time of travel
a) 100h (e)
b) 3.0 h
c) 100h
d) 3.0 h (e)

8) the airport is 60.0km away and you have 1.00h to get there. if your speed for the first 40.0 minutes is 48.0 k/h how fast must you travel in the remaining 20 minutes to get there within the time
a) 48.0 km/h
b) 84.0 km/h
c) 90.0 km/h
d) 180 km/h

9) if the velocity of a car is 16 m/s (S) and it travels for a time of 6.0 s what is the displacement? express the number correctly
a) 5.0 m/s
b) 5.0 m/s (s)
c) 44 m/s (s)
d) 66 m/s (s)

11) a car driver speeds up from 5.00 m/s [E] to 15.0 m/s [E] in 4.00s. Determine the cars acceleration
a) 40.0 m/s^2 (e)
b) 40.0 m/s (e)
c) 2.50 m/s^2 (e)
d) 2.50 m/s (e)

12) an 1800 kg volkswagen travelling at 60.0 km/h impacts into a concrete barrier and stops in 0.420s. the magnitude of the collision force on the automobile is
a) 2.57x10^5 N
b) 7.14x10^4 N
c) 1.26x10^4 N
d) 1.08x10^5 N

13) According to newtons ..... law an object with no net force acting on it remains at rest or in motion With a constant velocity
a) 3rd
b)4th
c)2nd
d) 1st

14) newtons second law of motion states that
a) the acceleration of an object is a ratio of the net force over its mass
b) forces always act in pairs
c) for every action there is an equal but opposite reaction
d) the inertia of an object is inversely proportional to objects mass

15) a block of dry ice weighing 1969 N is lying on a walkway. the coefficient of friction of the walking surface is 0.125, with what force must you push or pull the block to move it?
a) 1.57x10^4 N
b) 1960 N
c) 245 N
d) 6.38x10^-5 N

16) two masses are connected by a string and plled along a frictionless surface by another string to which a tension of 40.0 N is applied. The magnitude of the systems acceleration is
a) 8.0 m/s^2
b) 20 m/s^2
c) 13 m/s^2
d) 2.7 m/s^2

17) an elevator that weighs 3.5x10^3N is accelerated upward at 1.0 m/s ^2, what force does the cable exert to give it this acceleration?
a) 357 N
b) 0N
c)3500 N
d) 3857 N

18) the acceleration due ot gravity on the moon is 1/6 of that on earth. the weight of a 10 kg mass on the moon is
a) 98 N
b) 60 N
c) 16 N
d) 1.7 N

19) according to newtons law of universal gravitation the force of attraction between any two masses is related directly tot he
a) velocity of the two masses
b) product of the two masses
c) distance between the masses
d) sum of the masses

WRITTEN RESPONSE (5 MARKS)

1) if a grocery art with a mass of 16.5 kg accelerates at +2.31 m/s^2 against a frictional force of -15.4 N what must the applied force be ? (2)

2) two forces act on an object. One force is 6.55 N west and the other is 8.44 N north. what is the magnitude and direction of the resultant force?