The specific heat capacity of water is: C=______ J / (kg ·℃), the physical meaning of which is______ ．

The specific heat capacity of water is: C=______ J / (kg ·℃), the physical meaning of which is______ ．

The specific heat capacity of water is 4.2 × 103J / (kg ·℃). Its physical meaning is that the heat absorbed (or released) by 1kg of water increases (or decreases) 1C is 4200j. So the answer is: 4.2 × 103; the heat absorbed (or released) by 1kg of water increases (or decreases) 1C is 4200j

Can acceleration a be negative in formula F = ma

Yes, it means slowing down
According to Newton's second theorem, it means that in the absence of external force, the motion state of an object is static or keeps moving at a constant speed until there is an external force
Then, when the acceleration is negative, it means that an external force opposite to the direction of motion acts on the object, so the motion state will become uniform deceleration motion For example, when an object moving forward at a uniform speed on a smooth plane suddenly passes through a uniform rough plane, there will be friction to stop its motion, and then it will become a uniform deceleration motion

Exercises of logarithm function in senior one

1. If the range of AX + 3 of function y = 2x-1 is the union of negative infinity to - 1 and - 1 to positive infinity, then a =?
2. Let a = 0.9 to the power of 1.1, B = 1.1 to the power of 0.9, C = 2 to the power of 1.1?
3. If half power of a + negative half power of a = 4, then a + one of a =?
4. What is the domain of y = lgx + LG (5-3x)?
What is the range to the power of the absolute value of a negative x with y = a quarter?
What is the monotone decreasing component of x-x with y = one third?
Since the exponential function y = ax is a monotone function in the domain of definition (- ∞, + ∞), it has an inverse function
We call the inverse function of exponential function y = ax (a ＞ 0, a ≠ 1) logarithmic function and record it as y = logax (a ＞ 0, a ≠ 1)
Because the definition domain of exponential function y = ax is (- ∞, + ∞), and the value domain is (0, + ∞), so the definition domain of logarithmic function y = logax is (0, + ∞), and the value domain is (- ∞, + ∞)
2. The image and properties of logarithmic function

How to calculate 1 / 1 * 2 + 1 / 2 * 3 + 1 / 3 * 4 + 1 / 4 * 5 +... 1 / 39 * 40?

1/1*2+1/2*3+1/3*4+1/4*5+...1/39*40
=1-1/2+1/2-1/3+1/3-1/4+…… +1/39-1/40
=1-1/40
=39/40

Judging parity y = IIF (x mod 2,1,0) if y then print "odd" else print "even" end if in VB
Why if ythen
Instead of if y = 1 then?
What do you mean if y

In general programming languages, logic judgment true and false are equivalent to integers 1 and 0, that is, 1 is true, 0 is false, sometimes > 0 is true, = 0 is false. This is not very standard in VB, because there are special data types in VB: Logic types: true and false

1/3+1/15+1/35+1/63+1/99+1/145+1/195+1/255

1/2(1-1/3+1/3-1/5+1/5-1/7+...1/15-1/17)=8/17

How much RMB is one Hong Kong dollar?

Currency exchange
RMB 1 = HK $1.1844
1 HKD = 0.8443 RMB

Square of a / A + 6A + 9 △ square of a / A + 3

=a/(a+3)² ×(a+3)/a²
=1/a(a+3)
=1/(a²+3a)

Let the logarithm x, inequality x ^ 2log2 (4 (a + 1) / a) + 2xlog2 (2A / A + 1) + log2 ((a + 1) ^ 2 / 4A ^ 2) > 0 hold, and find the value range of A
The first factor is: (x ^ 2) log (4 (a + 1) / a)

If you don't offer a reward for such a troublesome problem, I'll take it as a volunteer. Ha ha (1) let's see if the solution set is all real numbers when log2 (4 (a + 1) / a) = 0. It's not because 2xlog2 (2A / A + 1) is not 0, so it can only be the following case
2log2 (4 (a + 1) / a) > 0 and the discriminant

How many square meters is a foot? How many square meters is 13660 feet

One square foot equals 0.0929 square meters. One inch = 0.0254 meters. One foot = 12 inches = 0.3048 meters