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What is the amount of heat required to change 2kg of ice at -15°c to water at 70°c ( C=4200jkg-¹k-¹
1.) Find the angular velocity of an object in non-circular motion with 2-m radius circular path. Its tangential speed is 10 m/s.
a. 5 radians per second
b. 50 radians per second
c. 20 radians per second
d. 10 radians per second
2.) In non-uniform circular motion, the direction of the centripetal acceleration is _____ inwards.
a. sometimes
b. oftentimes
c. always
d. never
3.) In uniform circular motion, angular velocity is
a. varying
b. constant, nonzero
c. increasing
4.) A satellite is placed in a circular orbit to observe the surface of Mars from an altitude of 144 km. The equatorial radius of Mars is 3397 km. If the speed of the satellite is 3480 m/s, what is the magnitude of the centripetal acceleration in m/s2of the satellite?
a. 3.42
b. 2.17
c. 2.99
d. 4.05
1.) In uniform circular motion, frequency is
a. Zero
b. Constant, nonzero
c. Increasing
d. Varying
2.) The following are the units of frequency, except for
a. Meter per second
b. Cycles per second
c. cps
d. Hertz
3.) Position angle is the ratio of the arc length and radius. If an object in non-uniform circular motion with 2-m radius circular path is at
position angle of 300 radians. find the arc length covered.
a. 300 m
b. 150 m
c. 75 m
d. 600 m
1.) A projectile is directed toward the sky with an angle of 45° from the level ground. It reaches a range of 10m in 10s. While in air, the projectile's horizontal acceleration is
a. - 9.81 m/s2
b. +9.81 m/s2
c. + 9.81 m/s2
d. 0
2.) If you launch one at an angle 45 degrees and another at 30 degrees, which angle gives you longer range?
a. both angles give same range
b. 45 degrees
c. 30 degrees
3.) A projectile is given a horizontal velocity. As it moves, its vertical speed
a. decreases
b. increases
c. fluctuates
d. remains constant
4.) For an object in uniform circular motion, what effect would be produced on the magnitude of the centripetal acceleration of the object if the mass of the object triples.
a. Quadruples
b. 1/2 as big
c. No change
d. Doubles
(1). A oven contains bismoth vapour (208kg) and is the maintained at 15000c. Calculate rms speed of the atoms on the oven, assuming the vapour is say to be mono atomic
r=8.31 Jm_1k_1.
(2). At what temperature is the rms speed of oxygen molecule equal to the rms speed of hydrogen molecule at 270c, the molecular mass of hydrogen is 2.02g/mol and oxygen is 32g/mol.
(3). differentiate between the real gases and ideal gases.
1.) After lockdown, Pedro has finally able to road test his brand-new car. He is waiting at a stoplight. When it finally turns green, he accelerated from rest at a rate of a 6 m/s2 for a time of 4 s. Determine his initial speed.
a. 6m/s
b. cannot be determined
c. 24 m/s
d. zero
2.) A parachutist weighs 1500 N. When he opens his parachute, it pulls upwards on him with a force of 2000 N. What is the magnitude of the resultant force acting on him?
a. 1.33 N
b. 3500 N
c. 500 N
d. 0.75 N
1.) If you are in a uniformly accelerated motion, this means that you are moving with
a. constant speed
b. constant velocity
c. constant displacement
d. constant acceleration
2.) A rightward-moving splinter is speeding up. What is the direction of it acceleration?
a. rightward
b. leftward
c. cannot be determined
d. none
3.) A splinter starts from rest and uniformly accelerates at a rate of 2m/s2 for 5.0 seconds. After determining his displacement during this 5- second time period, he started with an initial velocity of -3m/s. How would the object's new displacement compare the original displacement?
a. the same
b. bigger
c. decreased by 5 m
d. smaller
4.) After taking a rest, Mang Kanor starts traversing Edsa for an hour by foot due to unavailability of public transport brought about by lockdown. If he is accelerating 0.001 m/52, what is his initial speed?
a. 36 m/s
b. 0 m/s
c. 1.8 m/s
d. 3.6 m/s
A splinter starts from rest and uniformly accelerates at a rate of 2m/s2 for 5.0 seconds. What is his final velocity?
a. 20 m/s
b. 10 m/s
c. 5 m/s
d. 25 m/s
An object is released from rest and falls in the absence of air resistance. Which of the following is true about its acceleration?
a. Its acceleration is zero
b. Its acceleration is constant at 9.8 m/52
c. Its acceleration is initially 9.8 m/57, then decreases 9.8 m/s every second
d. Its acceleration is initially 9.8 m/52, then increases 9.8 m/s every second
A car accelerates from 10.0 m/s to 30.0 m/s at a rate of 3.00 m/s2. How far does the car travel while accelerating?
a. 226 m
b. 133 m
c. 399 m
d. 80 m
#333702 on Dec 2022