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A battery of e.m.f 12V supplies a current of 50 A for 2 minutes. How much energy is supplied in this time
A lead pellet is propelled vertically upward by an air rifle with an initial speed of 50 ft/s. Find its maximum height ?
A stone is dropped into the well and 4 seconds later the sound of splash is heard. If sound travels at a speed of 340 m/s, how deep is the well ?
A ball is thrown vertically downward from a cliff 48 m high and reaches the ground 2 s later. What was the ball's initial velocity ?
A ball is thrown vertically upward with a speed of 15 m/s.
A. what is its maximum height
B. when will it return
C. where will it be after 1 s ?
a block of mass 10kg on a rough horizontal surface is connected to all of mass M2=5kg by a light weight cord over a light weight friction less pully
A force of 120N at angle 53° of the horizontal applied to the block of mass 10kg the cofficent of kinetic friction b/n the surface and the block 0.3 then what is
The magnitude b/n the 2 blocks
The acceleration of the blocks
The tension b/n the 2 blocks
a student is only able to read the lecture notebook when it is held at 65.00cm from his eyes. what focal length and power must the lenses of his reading glasses have to bring his near point to the normal value
1.) A vector of 10 m/s is directed North-East. Approximately, what is its horizontal component?
a. 5 N
b. 880 N
c. 10 N
d. 7 N
2.) The components of a vector are the
a. Horizontal and vertical components
b. Horizontal and diagonal components
c. Vertical and diagonal components
d. Opposite directed components
3.) A relief good is dropped from a helicopter that is 300 m above the ground and rising at a rate of 13 m/s. How fast is the relief good going when it hits the ground?
a. 76.76 m/s
b. 77.8 m/s
c. 6.053 m/s
d. 55.76 m/s
4.) A dragster starts from rest and travels 1/4 mi in 6.70 s with constant acceleration. What is its speed in mi/h when it crosses the finish line?
a. 135
b. 269
c. 296
d. 188
Four 15-V cells are connected in a (a) series and (b) parallel. For each case, find the total voltage (VT). Suppose you divide the cells into two groups, each group consisting of two series cells. Then you connect these two groups parallel to each other. Also find the total voltage.
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 tire of 4s. Determine his displacement during this time period.
a. 12 m
b. 48 m
c. 24 m
d. 96 m
2.) Zeus with an initial velocity of 0 experiences a uniform acceleration of 5 m/s2. How much time will he take to reach a velocity of 125 m/s?
a. 3125 s
b. 0.04 s
c. 25 s
d. 625 s
3.) For a free falling body, why does it follow a straight path while falling downward?
a. only gravity is acting on the body
b. air resistance prevents it from moving in any direction other than straight downward
c. due to its initial speed
d. no external force is acting on the body
