The second hand of a clock moves from 12 : 10 to 12 : 30 . a. How many degrees does it move during this time? b. How many radians does it move during this time? c. If the second hand is 10 in . in length, determine the exact distance that the tip of the second hand travels during this time. d. Determine the exact angular speed of the second hand in radians per second. e. What is the exact linear speed (in inches per second) of the tip of the second hand? f. What is the amount of area that the second hand sweeps out during this time? Give the exact area in terms of π and then approximate to the nearest square inch
The second hand of a clock moves from 12 : 10 to 12 : 30 . a. How many degrees does it move during this time? b. How many radians does it move during this time? c. If the second hand is 10 in . in length, determine the exact distance that the tip of the second hand travels during this time. d. Determine the exact angular speed of the second hand in radians per second. e. What is the exact linear speed (in inches per second) of the tip of the second hand? f. What is the amount of area that the second hand sweeps out during this time? Give the exact area in terms of π and then approximate to the nearest square inch
Solution Summary: The author calculates the angle in degrees made by the second hand of a clock during the time 12:10 to 12:30.
The second hand of a clock moves from
12
:
10
to
12
:
30
.
a. How many degrees does it move during this time?
b. How many radians does it move during this time?
c. If the second hand is
10
in
.
in length, determine the exact distance that the tip of the second hand travels during this time.
d. Determine the exact angular speed of the second hand in radians per second.
e. What is the exact linear speed (in inches per second) of the tip of the second hand?
f. What is the amount of area that the second hand sweeps out during this time? Give the exact area in terms of
π
and then approximate to the nearest square inch
3.
Consider the sequences of functions f₁: [-π, π] → R,
sin(n²x)
An(2)
n
f pointwise as
(i) Find a function ƒ : [-T,π] → R such that fn
n∞. Further, show that fn →f uniformly on [-π,π] as n → ∞.
[20 Marks]
(ii) Does the sequence of derivatives f(x) has a pointwise limit on [-7, 7]?
Justify your answer.
[10 Marks]
1. (i) Give the definition of a metric on a set X.
[5 Marks]
(ii) Let X = {a, b, c} and let a function d : XxX → [0, ∞) be defined
as d(a, a) = d(b,b) = d(c, c) 0, d(a, c) = d(c, a) 1, d(a, b) = d(b, a) = 4,
d(b, c) = d(c,b) = 2. Decide whether d is a metric on X. Justify your answer.
=
(iii) Consider a metric space (R, d.), where
=
[10 Marks]
0
if x = y,
d* (x, y)
5
if xy.
In the metric space (R, d*), describe:
(a) open ball B2(0) of radius 2 centred at 0;
(b) closed ball B5(0) of radius 5 centred at 0;
(c) sphere S10 (0) of radius 10 centred at 0.
[5 Marks]
[5 Marks]
[5 Marks]
(c) sphere S10 (0) of radius 10 centred at 0.
[5 Marks]
2. Let C([a, b]) be the metric space of continuous functions on the interval
[a, b] with the metric
doo (f,g)
=
max f(x)g(x)|.
xЄ[a,b]
= 1x. Find:
Let f(x) = 1 - x² and g(x):
(i) do(f, g) in C'([0, 1]);
(ii) do(f,g) in C([−1, 1]).
[20 Marks]
[20 Marks]
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